diff --git a/.github/actions/benchmark-measure/action.yml b/.github/actions/benchmark-measure/action.yml
index 726824fb6f4..3d3e2375c73 100644
--- a/.github/actions/benchmark-measure/action.yml
+++ b/.github/actions/benchmark-measure/action.yml
@@ -50,6 +50,7 @@ runs:
       run: |
         set -euo pipefail
         tar -xf benchmark-build.tar -C "${RUNNER_TEMP}"
+        test -x "${RUNNER_TEMP}/benchmark-resource-launcher"
         storage=(--fixture-parent="${RUNNER_TEMP}")
         if [[ "${RUNNER_OS}" == Linux ]]; then
           storage=(--fixture-parent=/dev/shm --require-memory --require-cpu-affinity)
@@ -59,6 +60,7 @@ runs:
           cp "benchmark-report-${platform}.json" benchmark-shard.json
         fi
         python3 tools/benchmark_compare.py --binary="${RUNNER_TEMP}/benchmark-head" \
+          --resource-launcher="${RUNNER_TEMP}/benchmark-resource-launcher" \
           --report=benchmark-shard.json --head="${BENCHMARK_HEAD}" \
           --shard-plan=benchmark-plan.json --shard-index="${BENCHMARK_SHARD}" \
           --cpus=1 --cpus=3 --repetitions=3 --keep=3 --require-tools "${storage[@]}" \
diff --git a/.github/workflows/benchmark_backfill.yml b/.github/workflows/benchmark_backfill.yml
index b914228eaa8..4a92586353c 100644
--- a/.github/workflows/benchmark_backfill.yml
+++ b/.github/workflows/benchmark_backfill.yml
@@ -92,6 +92,12 @@ jobs:
         timeout-minutes: 165
         run: |
           set -euo pipefail
+          # Build the current accounting adapter before the driver freezes the batch.
+          bazel build //tools:process_resources_native --config=clang_release \
+            --disk_cache="${HOME}/.cache/bazel-disk"
+          launcher="$(bazel cquery //tools:process_resources_native --config=clang_release \
+            --output=starlark --starlark:expr='target.files_to_run.executable.path')"
+          cp "${launcher}" "${RUNNER_TEMP}/benchmark-resource-launcher"
           fixture_parent="${RUNNER_TEMP}"
           if [[ "${RUNNER_OS}" == Linux ]]; then
             fixture_parent=/dev/shm
@@ -99,6 +105,7 @@ jobs:
           python3 tools/benchmark_campaign.py run --repo="${GITHUB_WORKSPACE}" \
             --plan=campaign/campaign.json --job="${{ matrix.id }}" \
             --output="${RUNNER_TEMP}/backfill" --fixture-parent="${fixture_parent}" \
+            --resource-launcher="${RUNNER_TEMP}/benchmark-resource-launcher" \
             --disk-cache="${HOME}/.cache/bazel-disk"
       - uses: actions/upload-artifact@v7
         if: always()
diff --git a/.github/workflows/benchmarks.yml b/.github/workflows/benchmarks.yml
index 55961ca59ea..56785a064fb 100644
--- a/.github/workflows/benchmarks.yml
+++ b/.github/workflows/benchmarks.yml
@@ -63,6 +63,9 @@ jobs:
             --disk_cache="${HOME}/.cache/bazel-disk"
           cp bazel-bin/xff/cli/xff "${RUNNER_TEMP}/benchmark-head"
           cp bazel-bin/xff/engine/read_benchmark "${RUNNER_TEMP}/benchmark-head-reads"
+          launcher="$(bazel cquery //tools:process_resources_native --config=clang_release \
+            --output=starlark --starlark:expr='target.files_to_run.executable.path')"
+          cp "${launcher}" "${RUNNER_TEMP}/benchmark-resource-launcher"
           driver="$(pwd)/$(bazel cquery //tools:benchmark_resources --config=clang_release \
             --output=starlark --starlark:expr='target.files_to_run.executable.path')"
           (
@@ -141,7 +144,7 @@ jobs:
           python3 tools/benchmark_shards.py --plan --adaptive --count=5 "${scales[@]}" \
             --partition=samples --repetitions=15 --keep=15 \
             --cpus=1 --cpus=${{ matrix.cpus }} --output=benchmark-plan.json
-          tar -cf benchmark-build.tar -C "${RUNNER_TEMP}" benchmark-head
+          tar -cf benchmark-build.tar -C "${RUNNER_TEMP}" benchmark-head benchmark-resource-launcher
       - uses: actions/upload-artifact@v7
         with:
           name: benchmark-build-${{ matrix.platform }}
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 23846f6014d..43352a9192a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -750,9 +750,12 @@ jobs:
           namespace: default
       - name: Build one optimized binary for all three measurement shards
         run: |
-          bazel build //xff/cli:xff //xff/engine:expression_benchmark //xff/engine:expression_run_benchmark --config=clang_release --disk_cache="${HOME}/.cache/bazel-disk"
+          bazel build //xff/cli:xff //tools:process_resources_native //xff/engine:expression_benchmark //xff/engine:expression_run_benchmark --config=clang_release --disk_cache="${HOME}/.cache/bazel-disk"
           cp bazel-bin/xff/cli/xff "${RUNNER_TEMP}/benchmark-head"
-          tar -cf benchmark-build.tar -C "${RUNNER_TEMP}" benchmark-head
+          launcher="$(bazel cquery //tools:process_resources_native --config=clang_release \
+            --output=starlark --starlark:expr='target.files_to_run.executable.path')"
+          cp "${launcher}" "${RUNNER_TEMP}/benchmark-resource-launcher"
+          tar -cf benchmark-build.tar -C "${RUNNER_TEMP}" benchmark-head benchmark-resource-launcher
       - name: Measure expression preparation and execution baseline
         run: |
           bazel run //xff/engine:expression_benchmark --config=clang_release --disk_cache="${HOME}/.cache/bazel-disk" -- \
diff --git a/BUILD.bazel b/BUILD.bazel
index 79bbf9fda7c..62bd24d766e 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -76,6 +76,7 @@ filegroup(
         ".github/actions/bazel-cache-restore/action.yml",
         ".github/actions/bazel-cache-save/action.yml",
         ".github/actions/benchmark-measure/action.yml",
+        ".github/workflows/benchmark_backfill.yml",
         ".github/workflows/benchmark_pages.yml",
         ".github/workflows/benchmarks.yml",
         ".github/workflows/cache_size.yml",
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7b993042db3..6af137e5ca1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -40,8 +40,13 @@ Run all tooling suites with `bazel test //tools:python_tests`; they also run und
 The benchmark integration is `//xff/engine:read_benchmark_test`. Run the measurement commands with
 `bazel run //tools:measure_resources -- -- COMMAND...` or
 `bazel run //tools:benchmark_resources -- XFF --output=REPORT.json`.
-The benchmark driver declares its measurement executable and runs each measurement in a fresh
-process, preserving per-invocation peak-memory accounting. Direct script invocation remains available.
+The benchmark driver declares its measurement executable and a small native pipeline launcher.
+Each measurement uses a fresh process, and the native launcher accounts for individual commands
+after leaving Python's address space. RSS remains a kernel high-water mark with the native
+pre-exec footprint included; pipeline peak sums are not simultaneous peaks. Accounting methods
+are recorded separately so they cannot share incompatible timing baselines. Direct script
+invocation remains available with a prebuilt `--resource-launcher`; see
+[native process accounting](docs/benchmark-comparisons.md#native-process-accounting).
 
 Pre-commit owns changed-file formatting and policy checks, plus fast, narrowly triggered checker
 self-tests. Its Python hooks use the managed Python 3.13 environment. Process-measurement and fuzz
diff --git a/docs/benchmark-comparisons.md b/docs/benchmark-comparisons.md
index 50742eba568..aceab18c721 100644
--- a/docs/benchmark-comparisons.md
+++ b/docs/benchmark-comparisons.md
@@ -172,6 +172,57 @@ downloaded, and hosted CI remains unchanged until the local measurements support
 
 ## Tasks and equivalence
 
+### Native process accounting
+
+New collections use a small native pipeline launcher after the fresh Python
+worker. The native process forks the measured commands only after exec has
+discarded Python's address space; its own `wait4` usage is not reported as a tool
+measurement. Each direct command has an individual RSS high-water mark. Pipeline
+memory remains the sum of those individual peaks, an upper bound rather than a
+simultaneous peak. The kernel can still include the smaller native child's
+pre-exec footprint, so very small-command RSS needs a native control before
+attributing it to the command's allocations.
+
+The extra native launch boundary is deliberately included in elapsed and
+first-output wall time. CPU usage and peaks account for the measured commands,
+including their native pre-exec setup, not the accounting parent. New reports
+record the launcher binary hash and the
+memory/wall-time method in `contract.resource_accounting`; the full executable
+path is retained separately in `resource_launcher`, and merged shard provenance
+preserves each host's launcher identity. Different accounting methods
+or launcher hashes cannot share main baselines or normalization windows. Older
+reports remain unchanged and renderable, and dataset catalogs retain both methods
+and their observations under the same workload recipe. Do not infer an engine
+speedup from an old-method/new-method timing comparison.
+
+Bazel declares and builds the launcher before executing measurement tools. Direct
+script use requires an explicit prebuilt binary; measurement never triggers a
+build. For example, prepare it before any timing session:
+
+```sh
+bazel build //tools:process_resources_native --config=clang_release
+launcher=$(bazel cquery //tools:process_resources_native --config=clang_release --output=files)
+python3.13 tools/benchmark_compare.py --resource-launcher="$PWD/$launcher" \
+  --binary=/path/to/optimized/xff --report=/tmp/native-comparison.json --cpus=1
+```
+
+The PR and main CI build jobs retain the optimized accounting helper alongside
+XFF in `benchmark-build.tar`. Every measurement shard consumes that same
+prebuilt helper through `--resource-launcher`; it does not run Bazel. Hosted
+historical backfill builds and copies the current helper before freezing its
+batch and building historical XFF revisions. This separates the accounting
+adapter's identity from the measured source revision and keeps compilation
+outside the measurement phase on both Linux and macOS.
+
+The standalone resource tool, backfill driver and local benchmark command also
+accept `--resource-launcher`. Frozen backfill contracts include the actual
+launcher identity and both accounting source files. Changing either the driver
+or launcher requires a new batch; it cannot retrofit memory measurements in an
+existing batch. The launcher inherits the fresh worker's affinity and process
+group, so the comparison timeout still terminates the complete pipeline.
+
+### Task populations and output
+
 | Task                   | Participants           | Contract                                              |
 | ---------------------- | ---------------------- | ----------------------------------------------------- |
 | File enumeration       | xff, find, rg          | All regular files, including hidden and ignored names |
diff --git a/docs/benchmark-correctness-audit.md b/docs/benchmark-correctness-audit.md
index 340b741115b..45fe5937afe 100644
--- a/docs/benchmark-correctness-audit.md
+++ b/docs/benchmark-correctness-audit.md
@@ -112,8 +112,9 @@ retrofit the binary identity of a historical measurement.
 
 Regular CI retains report artifacts for 30 days and executable build artifacts for three days;
 hosted backfill artifacts omit executables. Preserve available original binaries, build manifests
-and logs before cleanup or artifact expiry. Linux executable verification remains outstanding;
-the 72 checked Mac binaries do not verify the Linux measurements.
+and logs before cleanup or artifact expiry. The initial Mac audit left Linux executable
+verification outstanding; the native Linux follow-up below now covers the available local
+Linux artifacts. The 72 checked Mac binaries do not verify the Linux measurements.
 
 On Linux, verify each retained executable against its original report with the PR's
 `tools/benchmark_provenance.py --report=... --binary=... --retention-reference=...` command.
@@ -233,14 +234,75 @@ Profiling must not compete with accepted timing collection.
 
 Linux reported RSS needs an independent check: small XFF, find and rg runs all show a similar
 roughly 25 MB floor. The forked Python launcher may contribute a pre-exec high-water mark to
-`wait4` RSS. This is a hypothesis, not an established defect. Compare a direct native launcher
+`wait4` RSS. This was the initial hypothesis; the native controls below establish the Linux
+defect. Compare a direct native launcher
 and `/usr/bin/time -v` against the Python worker before using this metric to diagnose arenas.
 
+A native pipeline accounting follow-up is separate from engine changes. It
+forks measured commands after leaving Python's address space and records a
+distinct wall-time/memory method and launcher hash. Ten affected tool suites pass
+on native Linux, including an inflated Python parent, actual child allocations,
+individual pipeline peaks, output, affinity, closed stdin, termination cleanup
+and direct-script runfiles resolution. Frozen batches and every incoming shard
+validate the launcher method/hash; merged provenance retains each host's path.
+All 57 Python tooling suites and the repository-wide tooling check pass on
+Linux. Reports display the accounting boundary and launcher hash, or warn
+about the legacy Python floor, without modifying historical observations.
+
+Hosted validation found two follow-up integration issues. Darwin defines
+`sigemptyset` as a function-like macro, so the helper must invoke it without a
+namespace qualifier. The direct-Python benchmark shards also need the prebuilt
+helper in their shared artifact, not just XFF. Local fixes stage the helper in
+PR/main build archives, pass its explicit path to the measurement action, and
+prepare it before hosted backfill freezes a batch. Regression tests check those
+workflow boundaries and forbid Bazel builds in the shard action. After the
+independent clock-control measurement session and diagnostic profiles finished,
+all 57 tooling suites, the repository-wide tooling check and enforcing helper
+clang-tidy passed with these fixes. Follow-up hosted run `38011945259` passes
+full Linux/macOS tests and all three measurement shards on each platform,
+including actual native-helper execution on macOS. Independent native Mac
+accounting calibration and scheduler performance controls remain open.
+
+The optimized helper after the Darwin macro fix has SHA-256
+`60bcb395bb3d0eccccd0a3d0cb2407538b1f96c45d5e1e156a0bd4522f93328e`.
+Five additional native/Python/time controls per tool pass the same output oracle
+and reproduce the accounting-floor finding. Their raw observations are retained
+in [the portability follow-up controls](benchmarks/native-resource-accounting-portability-controls.json).
+The original control artifact remains unchanged; the earlier helper executable
+is also retained independently with the clock-control measurement evidence.
+
+A real backfill pilot built and verified the unchanged #990 executable, measured
+both v2 layouts and then reused the verified build and completed report on an
+identical resume. Its batch freezes the native launcher and both new driver
+source hashes; its report records the same launcher/method contract. Artifacts
+are retained at `/tmp/xff-native-accounting-backfill-final-pilot`, batch
+`dbd9ca40a57b277e4d55a21d894927d66caf4bf53be138082086eaf1b02dcf4a`.
+The 10-file, one-worker, one-sample pilot is a workflow/correctness check, not
+the complete prepared-grid performance workload or acceptance evidence.
+
+Five independent 20-file controls per tool compare the optimized native launcher,
+the original fresh Python worker and `/usr/bin/time` against the same commands
+and correctness oracle. XFF is about 5.2 MiB under both native methods versus
+about 24 MiB with Python. `true` is about 1.5 MiB with both native methods versus
+about 24 MiB with Python; find and rg likewise lose that Python floor. This
+establishes the Linux accounting defect, not an engine allocation improvement.
+Retained commands, executable hashes and all raw peaks are in
+[the independent accounting controls](benchmarks/native-resource-accounting-controls.json);
+the final local artifact is `/tmp/xff-resource-accounting-final-controls.json`.
+Launcher SHA-256 for the original controls is
+`e6766cea6431e91b5a5c1d16746079d59ed0e70bb13bce220e9796d23a09fb89`.
+
+The new boundary includes launcher startup/teardown in wall time and still
+permits native pre-exec footprint in kernel high-water accounting. Native macOS
+controls and the 20k/50k/100k allocation investigation remain pending. Historical
+reports remain intact and cannot normalize against the new method; corrected
+memory measurements cannot be retrofitted to an old observation.
+
 ### macOS control and acceptance
 
 Run the same fixtures and experimental commits on the M5 Pro. Profile thread creation,
 coordinator work and allocation with native sampling/Instruments. Record performance/efficiency
-core scheduling limits; a worker count is not Linux-style verified physical-core affinity.
+core scheduling limits; a worker count alone does not prove physical-core affinity.
 
 Accept an engine change only after repeated A/B measurements preserve result hashes and improve
 the targeted cells, with no material regressions in single-worker, large-grid, deep, content,
@@ -248,3 +310,564 @@ metadata and slow-storage controls on both platforms. Run affected correctness/c
 and appropriate sanitizers. Report absolute XFF time, reference time and same-run ratio together.
 The current evidence supports investigating specific costs; it does not establish that XFF
 will beat every reference tool on every workload.
+
+## Native Linux follow-up (2026-10-09)
+
+The native session uses merged audit driver commit
+`4ea895f63106f05df7c90b629d20433ae1e03016`. The original engine baseline remains
+`772994ab7905be77915978f06ea90ae5934aaeef`. The retained original baseline and
+the fresh merged-driver build agree on executable SHA-256,
+`f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106`.
+Their engine and tracked build-configuration sources are identical. The clock
+controls below use the merged-driver revision; they do not substitute for the
+requested fresh exact-revision baseline control on both native platforms.
+Baseline builds use `clang_release`, with the historical ICU 70 build-library
+path supplied explicitly. Complete prepared-grid runs retain nine raw samples
+per cell, use the fastest seven estimator and store fixtures on verified tmpfs.
+
+### Host topology and storage limitations
+
+A read-only observation at `2026-10-10T09:36:42+00:00` identifies this Linux
+environment as a KVM guest with ten allocated CPUs. Guest topology and affinity
+are observable, but do not independently prove ten dedicated host physical
+cores or host-side pinning. The workspace is ext4 on an exposed QEMU virtual
+disk; its physical backing and storage latency are not established. Both
+`/tmp` and `/dev/shm` are tmpfs, so a fixture under `/tmp` is not a disk or
+slow-storage control.
+
+This observation postdates the earlier collections and is not proof of their
+historical hypervisor state. Original reports, manifests and retained bytes
+remain unchanged, including fields named `physical_cpu_ids`: interpret those
+as recorded topology/affinity evidence, not independent host-pinning proof.
+The guest observations support descriptive within-environment comparisons and
+correctness controls, not bare-metal, physical-storage or slow-filesystem
+acceptance. The [host-context evidence](benchmarks/native-linux-host-context.json)
+preserves all eight original observation outputs and their hashes. Its original
+source manifest is `/tmp/xff-scheduler-host-context.json`, SHA-256
+`175eec896d2bbe4812a33e296a24e6a2dce153430582502a124126f7c512163b`.
+
+### Retained Linux executables
+
+All 142 completed reports under the local Linux benchmark batch inventory match
+their original retained executables and their original build manifests. They
+cover 72 distinct commits and 38 distinct executable hashes; no mismatches were
+found. Verification uses `benchmark_provenance.verify_retention`, checks the
+standalone manifest against the report's embedded build record, and records a
+measurement-bound proof for each report. Historical observations are unchanged.
+
+The original reports and binaries remain under `/home/marcus/xff-benchmarks/batches`.
+The native proof inventory is retained at
+`/tmp/xff-linux-retention-verification/summary.json`, with per-report
+`binary-verification.json` files below that directory. These checks verify the
+available local Linux artifacts; they do not verify expired hosted artifacts.
+
+### Worker scheduling experiment
+
+Linux `kernel.perf_event_paranoid` is now `0`, and native `perf` hardware counters
+are available. Startup-boundary profiles include worker creation and teardown,
+Abseil mutex slow paths and scheduling overhead; those observations alone do not
+attribute the startup cost to pthread creation. Keeping directory reads serial
+removes the small-work cliff but loses useful concurrency on large broad trees.
+[PR #991](https://github.com/mboworks/xff/pull/991) admits directory reads only
+when at least 64 independent sibling directories are available. Its hosted Linux
+and macOS tests, sanitizers, all three benchmark shards on each platform and
+combined benchmark comparison pass.
+
+The next experiment shares one traversal-owned executor across directory read-ahead,
+eager stat work and eligible content matching. Each admitted batch submits at
+most one drain job per useful worker. Directory jobs repeatedly claim independent
+listing reads; stat jobs claim 128-entry chunks; matcher jobs claim entry chunks.
+Only the coordinator recurses, evaluates traversal controls and consumes ordered
+results. Background workers remain bounded by the per-traversal allowance and
+are reused until traversal completion; the coordinator is additional. Comparison
+still has separate traversal/comparison ownership, as detailed below.
+
+Reuse alone does not establish efficient scheduling. Directory drain jobs currently
+run until their sibling batch is exhausted, so they can occupy all workers while
+the coordinator waits for a queued content or eager-stat batch. Controls must
+check foreground progress and pool contention, not just thread creation counts.
+The candidate in the current clean collection also counts previously processed
+entries for cold matcher admission; that count is not evidence that enough work
+remains to amortize startup, especially for a small rendered-content batch near
+the end of a run. Hosted benchmark alarms also contradict accepting that policy:
+on macOS, broad content-needle at 5,000 files and three workers measures 64.02 ms
+versus main's 33.45 ms, while rg measures 57.29 ms versus 60.31 ms. Linux reports
+content alarms at 2,000 and 5,000 files as well. The benchmark check is
+non-blocking; its green conclusion is not evidence that these controls passed.
+These hosted reports use the legacy prepared grid, not the native v2 fixtures,
+so they are portability warning evidence, not a substitute for the native audit.
+
+A local follow-up removes the accumulated count and fixed 8,192-entry startup
+gate. It estimates pending work from a 16-entry prefix, excluding that completed
+prefix and all past batches. Useful worker count is capped by remaining entries,
+the configured allowance and estimated work per worker (experimental budgets:
+500 microseconds cold, 50 microseconds warm). At least two workers and 16 pending
+entries per worker are required. Pure policy tests cover count/time boundaries
+without asserting that instrumented or descheduled execution is fast. The
+follow-up passes seven affected normal suites (including generated-reference
+validation) and six affected suites under MSan, TSan and ASan/UBSan. It has not
+been measured and is not the frozen candidate in the completed collection.
+Estimator representativeness, admission budgets and queue fairness remain
+experimental pending controls.
+
+### Isolated mutex-clock startup finding
+
+The completed native profiling session retains 36 cells: broad 10/20 and deep
+1,000/2,000, workers 1/3/10, and unchanged baseline, #991 and frozen #992 binaries.
+Each cell includes nine fresh-process `perf stat` observations, 200 fresh-process
+invocations under `perf record`, one discarded correctness-checked warmup and one
+syscall trace. All 7,596 fresh invocations passed the fixture output oracle.
+The complete 13-size grid defines both prepared maximum trees; materialized
+trees, anchor hashes and retained original binaries were checked before and
+after profiling. These instrumented observations are diagnostic, not acceptance
+timings. Raw evidence is retained at `/tmp/xff-native-startup-profile-session1`.
+
+Eight additional `strace -k` sleep-stack controls identify a specific Linux/x86
+startup mechanism. The baseline parallel boundary requests 1 ms and 2 ms sleeps
+inside Abseil's `MeasureTscFrequencyWithSleep`. Symbolized frames lead from
+`ReadPool::Run` through the mutex wait-queue `Enqueue` operation and
+`CycleClock::Frequency` to this one-time calibration. The baseline single-worker
+controls and #991's inline directory controls do not request these calibration
+sleeps. Raw sleep-stack controls are retained at
+`/tmp/xff-native-calibration-trace-session1`; ELF trace offsets must be mapped
+through the executable LOAD segment before symbolization.
+
+The pinned Abseil 20260817.0 source uses the sysfs TSC frequency when available.
+This host lacks `/sys/devices/system/cpu/cpu0/tsc_freq_khz`, so its x86 fallback
+starts at a 1 ms sleep and doubles until consecutive estimates agree within 1%.
+Other threads can spin or back off while that initialization completes. This
+is an associated mutex initialization cost, not a per-thread creation cost, and
+invalidates treating the provisional 500-microsecond cold-worker budget as a
+measured startup model.
+
+An isolated unchanged-baseline build disables Abseil's optional unscaled cycle
+clock with `--copt=-DABSL_USE_UNSCALED_CYCLECLOCK=0` and the matching
+`--host_copt`, retaining all other historical release options. It uses the steady
+clock with a fixed nanosecond frequency instead of TSC calibration. The four
+affected walk/matcher/run/rg suites pass. Its retained build is
+`/tmp/xff-absl-clock-control-build`, executable SHA-256
+`978f67355a6ebcd7362db1a995e70c143b3abca4de1014daa5d8d003d13c5909`.
+Three independent ascending, descending and seeded-shuffle timing sessions
+completed at `/tmp/xff-clock-control-repeated-session1`. Each creates fresh full
+prepared maximum trees using all 13 grid sizes, with workers 1/3/10 and recorded
+ten-CPU guest allocation. Enumeration runs at every anchor; content-needle
+and absent-content controls run at 5k/20k/50k/100k. The three participants are
+unchanged baseline, the same-source clock-only build and rg. Their order rotates
+between rounds. Every cell has one discarded warmup and nine retained samples,
+with fastest seven calculated independently. The 378 cells retain 10,206 samples;
+all 11,340 invocations, including warmups, passed the output oracle. Materialized
+fixture trees and executables were verified before and after collection.
+
+The following times are medians of the three independent session estimates.
+Changes are medians of same-session clock/baseline ratios, not ratios of the
+separate medians. Raw samples are not pooled across sessions.
+
+| Layout | Files | Workers | Baseline ms | Clock-only ms | rg ms | Paired change |
+| :----- | ----: | ------: | ----------: | ------------: | ----: | ------------: |
+| broad  |    20 |       3 |       5.258 |         2.069 | 3.232 |        -60.3% |
+| deep   |  2000 |       3 |       5.939 |         2.946 | 4.251 |        -51.0% |
+| broad  |    10 |       1 |       1.762 |         1.796 | 1.565 |         +3.2% |
+
+The tiny single-worker regression occurs in all three sessions, ranging from
+1.94% to 4.14%; it must not be discarded as an unchanged control. Both variants
+use the same native accounting helper, including helper startup in wall time.
+Their absolute times must not be pooled with historical Python-launch timings.
+
+A separate completed native control profiles baseline and clock-only builds at
+broad 20/deep 2k with workers 1/3/10: twelve cells, nine fresh `perf stat`
+observations plus a warmup and a symbolized syscall trace per cell. All 132
+invocations pass the oracle. At the parallel boundary both builds still create
+exactly two workers; only the baseline requests the 1 ms and 2 ms calibration
+sleeps. Single-worker controls request neither. These counters and trace
+durations are diagnostic and are not included in the uninstrumented timings.
+No default build setting has changed. Apple already disables the optional clock
+in this Abseil version; that source fact is not macOS performance validation.
+
+#### Retained clock-control review artifacts
+
+The [machine-readable index and complete cell summaries](benchmarks/native-clock-startup-controls.json)
+record commands, build and binary identities, fixture hashes, sampling policy,
+allocation, all per-session estimates, native mechanism controls and archive
+SHA-256 values. Download the four gzip-compressed JSON archives for raw evidence:
+
+- [Native profiles, calibration stacks and reproduction scripts](benchmarks/native-clock-startup-profiles.json.gz).
+- [Ascending timing session](benchmarks/native-clock-startup-timings-1.json.gz).
+- [Descending timing session](benchmarks/native-clock-startup-timings-2.json.gz).
+- [Seeded-shuffle timing session](benchmarks/native-clock-startup-timings-3.json.gz).
+
+The profiles archive retains the 36-cell startup counters/traces, eight
+symbolized calibration calls, the twelve clock-only mechanism controls, build
+and measurement manifests, analyses and exact reproduction scripts. Each timing
+archive preserves its full report, including all samples and correctness
+observations. Verify compressed and decompressed hashes against the index before
+analysis. Original executables and large `perf.data` recordings remain at their
+recorded local retention paths; the review artifacts include their hashes, not
+their bytes. The historical native accounting helper is separately retained and
+hash-verified so later helper builds do not invalidate these observations.
+
+These completed controls isolate a Linux startup mechanism. They do not establish
+acceptance of #991's directory threshold, #992's executor policy, or a default
+clock configuration. Eager metadata, slow-storage and native macOS controls
+remain open, as do allocation and large-grid slope investigations.
+
+### Shared-executor correctness coverage
+
+Correctness checks include nested read-ahead above the admission threshold,
+partial stat chunks with missing entries, repeated matcher transitions and
+executor reuse. An early-stop test deliberately holds a prefetched sibling read
+open while the coordinator quits: `Walk` must wait before destroying the walker,
+even though its executor survives for another phase. Explicit Abseil completion
+signals replaced the experiment's standard-library futures after expanded TSan
+coverage reported a shared-state completion/deallocation race.
+
+The interrupted `/tmp/xff-perf-shared-executor-v2` run is diagnostic only:
+correctness builds overlapped its measurements, and its measured source predates
+the final scheduling changes. It supplies no acceptance timing evidence.
+
+### Command-wide scheduling gap
+
+The frozen #992 executor is owned by one `RunFindCore` traversal, not by the
+complete command. Comparison starts the left traversal with unconditional
+`std::async` and runs the right traversal on the calling thread. Each traversal
+creates its own executor with the configured worker allowance. Consequently,
+comparison can have two coordinators and two independent worker pools; even
+`--jobs=1` still starts the extra comparison coordinator. After both traversals
+finish, `ParallelCompare` creates another pool for eligible file pairs rather
+than reusing their workers. The concurrent comparison coordinators predate #992;
+the draft does not fix that existing command-wide ownership gap.
+
+Directory drain jobs also consume their entire sibling batch before returning
+to the common queue. Giving each worker a long-lived drain amortizes dispatch,
+but can delay queued content and metadata work. Read-ahead retains complete
+listings without a command-wide byte budget, and quit waits for already queued
+reads rather than canceling unnecessary work. A bounded pool alone does not
+prove a bounded frontier, fair scheduling or enough useful remaining work.
+
+The next scheduler design must define whether the coordinator counts toward
+the command's concurrency allowance, share that allowance across comparison
+sides and phases, bound pending work and retained bytes, and balance substantial
+batches without starving another stage. Workers must not wait on child tasks in
+their own executor. Do not simply pass the current executor to two concurrent
+coordinators: its startup and worker-count interface assumes one coordinator.
+Thread reuse and count-based admission are not acceptance evidence for these
+requirements; native Linux and M5 Pro controls remain necessary.
+
+### Memory-accounting finding and remaining acceptance work
+
+Direct `/usr/bin/time -v` runs show approximately 5.3-5.4 MiB peak RSS for a small
+XFF invocation, while the Python comparison worker reports approximately
+22-23 MiB for the same command. A trivial native command also reproduces the
+Python worker's high floor. The forked launcher's inherited high-water mark must
+be corrected or explicitly excluded before using those reported peaks to choose
+arena sizes. This is separate from the worker scheduler experiment.
+
+The clean full-grid collection at `/tmp/xff-perf-shared-executor-clean-v2`
+completed before later correctness builds. Its three independently verified
+binaries have identical fixture, oracle, allocation and reference identities
+across all 858 task cells. It reproduces the baseline small-work cliff, but also
+shows content regressions in the frozen #992 candidate; it is one sequential
+session, not repeated/reordered acceptance. The local cost-aware follow-up has
+not been measured by that collection.
+
+### Fresh exact-source full-grid Linux baseline (2026-10-10)
+
+The exact initially requested source, `772994ab7905be77915978f06ea90ae5934aaeef`,
+has now been freshly built with its historical `clang_release` configuration.
+Clean source/HEAD/tree checks pass; the saved executable SHA-256 is
+`f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106`,
+matching the original retained baseline bytes. Its tracked build-configuration
+hashes match that exact source, not an inferred equivalent revision.
+
+The accounting driver is frozen at `0e296e40ca6bf523215d80d1dc02deb3503b796c`,
+including the additional #994 driver fixes beyond original #990. The batch
+records every driver-module hash and the retained native helper/method identity;
+do not claim this is the original #990 driver or combine its absolute timings
+with historical Python launching. All compilation finished before measurement.
+
+The complete 13-anchor grid, broad/v2 and deep/v2, workers 1/3/10, recorded
+ten-CPU guest allowance, tmpfs, one discarded warmup and nine samples/fastest
+seven completed in batch
+`f586e579b2d57d0f9afa24e6d06849d6bc1df4d96654e5bcb349e77d8c6a9d1d`.
+All 858 task cells, 14,040 retained samples and 1,560 discarded warmups pass the
+collection oracle: 15,600 correct fresh participant invocations. A separate
+post-run verifier checks the original binary, standalone/embedded manifests,
+historical tracked configuration, frozen driver/helper, all task keys,
+fixture/anchor/oracle identities, affinity, sample validity/output lengths,
+native resource accounting and independently recomputed fastest-seven estimates.
+
+The small-work cliff is reproduced in this exact-source baseline:
+
+| Layout | Workers | Files | XFF ms | rg ms | XFF/rg |
+| :----- | ------: | ----: | -----: | ----: | -----: |
+| broad  |       1 |    10 |  1.894 | 1.653 |  1.146 |
+| broad  |       1 |    20 |  1.823 | 1.663 |  1.096 |
+| broad  |       3 |    10 |  1.842 | 3.103 |  0.594 |
+| broad  |       3 |    20 |  5.241 | 3.230 |  1.623 |
+| deep   |       1 |  1000 |  2.308 | 2.021 |  1.142 |
+| deep   |       1 |  2000 |  2.849 | 2.494 |  1.142 |
+| deep   |       3 |  1000 |  2.386 | 3.223 |  0.740 |
+| deep   |       3 |  2000 |  6.151 | 3.923 |  1.568 |
+
+Ten-worker controls likewise measure 5.232 ms at broad 20 and 6.121 ms at deep
+2k. The [baseline index](benchmarks/native-exact-baseline-controls.json) retains
+all selected enumeration rows, commands/contracts, checksums and limitations.
+The [complete derived analysis](benchmarks/native-exact-baseline-analysis.json.gz)
+contains every task's raw sample arrays, absolute estimates and same-run ratios.
+[Provenance and reproduction scripts](benchmarks/native-exact-baseline-provenance.json.gz)
+retain the frozen batch, original build log, both retention proofs, driver
+sources, executed-command handoff and verification/export code.
+
+The original report's exact JSON bytes are preserved in eleven lossless gzip
+byte chunks under the existing file-size policy:
+[1](benchmarks/native-exact-baseline-report-bytes-1.gz),
+[2](benchmarks/native-exact-baseline-report-bytes-2.gz),
+[3](benchmarks/native-exact-baseline-report-bytes-3.gz),
+[4](benchmarks/native-exact-baseline-report-bytes-4.gz),
+[5](benchmarks/native-exact-baseline-report-bytes-5.gz),
+[6](benchmarks/native-exact-baseline-report-bytes-6.gz),
+[7](benchmarks/native-exact-baseline-report-bytes-7.gz),
+[8](benchmarks/native-exact-baseline-report-bytes-8.gz),
+[9](benchmarks/native-exact-baseline-report-bytes-9.gz),
+[10](benchmarks/native-exact-baseline-report-bytes-10.gz), and
+[11](benchmarks/native-exact-baseline-report-bytes-11.gz).
+Decompress and concatenate in ascending index-recorded offset order; individual
+and reassembled SHA-256 checks verify the exact original bytes. The complete
+report/analysis, original binary/helper and build artifacts remain at
+`/tmp/xff-perf-baseline-exact772-native-session1`; review archives do not include
+the executable bytes themselves.
+
+Retained samples record output lengths rather than full stdout; collection
+checks the actual output oracle before retaining each sample. Post-run
+fixture/oracle regeneration reuses the pinned definitions, checking internal
+consistency rather than a separate implementation of the workload specification.
+Generated/ignored `MODULE.bazel.lock` cannot be compared to a tracked Git blob.
+This is one ordered Linux baseline session, not repeated/reordered engine A/B
+acceptance or native Mac evidence. The provenance archive also includes a
+same-driver/exact-source M5 Pro baseline handoff script, syntax-checked only on
+Linux. It retains the helper before historical compilation and records hardware,
+P/E-core keys and storage without claiming Linux affinity or verified RAM-disk
+storage; it has not run on macOS. Native Mac accounting, Instruments, allocation
+and repeated/reordered acceptance remain required.
+
+### Large single-worker allocation diagnostics (2026-10-10)
+
+A user-local Heaptrack 1.5.0 bundle was extracted under `/tmp`; all five Ubuntu
+package archives match their repository SHA-256 values. No system package or
+security setting changed. A known malloc/realloc control verifies three explicit
+allocation calls and a 6 MiB live allocation peak, plus the independently
+identified runtime allocation. Periodic short-process snapshots miss that peak;
+the following heap values instead come from every allocation/free event.
+
+The unchanged retained baseline was profiled once at 20k/50k/100k files with one
+worker on each full-grid v2 layout. Each cell also runs once without Heaptrack
+through the native resource launcher for independent RSS. Both commands pass the
+same original output oracle; complete materialized maximum trees and executable
+identities match before/after. These are twelve correct diagnostic invocations,
+not repeated timing controls. Tracked requested heap bytes and native RSS are
+different metrics; non-interposed allocation mechanisms are outside Heaptrack's
+coverage, and profiler overhead is excluded from the separate RSS control.
+
+| Layout |  Files | Allocation calls | Peak tracked heap MiB | Native RSS MiB |
+| :----- | -----: | ---------------: | --------------------: | -------------: |
+| broad  |  20000 |            46106 |                 0.178 |          5.191 |
+| broad  |  50000 |           112294 |                 0.238 |          5.281 |
+| broad  | 100000 |           223942 |                 0.311 |          5.531 |
+| deep   |  20000 |            41890 |                 3.174 |          8.469 |
+| deep   |  50000 |           106565 |                14.858 |         20.500 |
+| deep   | 100000 |           211212 |                34.006 |         40.191 |
+
+Deep traversal retains much more live heap despite similar allocation counts.
+At its 100k global peak, summing stack weights containing `ReadDir::JoinPath`
+accounts for about 24.3 MiB; stacks containing `StatEntries` and `reserve`
+account for about 9.2 MiB. Source inspection shows each recursive `Descend`
+retains its parent listing while `HandleChildren` descends further; those
+listings hold full path strings and entry vectors. This is evidence for examining
+listing/path lifetime and depth-dependent path length, not for increasing an
+arena reserve. It does not establish the CPU-time contribution or validate a
+lifetime optimization.
+
+The [allocation index](benchmarks/native-large-allocation-controls.json)
+retains package/control provenance, build and helper identities, all six cells,
+raw-profile hashes, independent RSS observations and archive checksums. Download
+the per-cell archives for original zstd Heaptrack bytes, complete allocation and
+global-peak stacks, analyzer output, command stdout/stderr and reproduction scripts:
+
+- [Broad 20k](benchmarks/native-large-allocation-profiles-broad-20000-jobs1-files.json.gz),
+  [50k](benchmarks/native-large-allocation-profiles-broad-50000-jobs1-files.json.gz),
+  [100k](benchmarks/native-large-allocation-profiles-broad-100000-jobs1-files.json.gz).
+- [Deep 20k](benchmarks/native-large-allocation-profiles-deep-20000-jobs1-files.json.gz),
+  [50k](benchmarks/native-large-allocation-profiles-deep-50000-jobs1-files.json.gz),
+  [100k](benchmarks/native-large-allocation-profiles-deep-100000-jobs1-files.json.gz).
+
+Deep 100k's complete raw stdout is split into three lossless gzip byte chunks:
+[part 1](benchmarks/native-large-allocation-deep-100000-stdout-1.gz),
+[part 2](benchmarks/native-large-allocation-deep-100000-stdout-2.gz), and
+[part 3](benchmarks/native-large-allocation-deep-100000-stdout-3.gz).
+The index records their byte offsets and compressed/decompressed hashes; the
+cell archive records the reassembled stream hash. Decompress and concatenate in
+ascending offset order. All allocation-event totals are recomputed, and the
+complete allocation/global-peak stack weights independently sum to those totals.
+Original native artifacts remain at `/tmp/xff-native-large-allocation-profile-session1`.
+
+### Large single-worker CPU diagnostics (2026-10-10)
+
+The unchanged retained baseline executable was profiled on freshly materialized
+full-grid v2 broad/deep trees at 20k/50k/100k files, pinned to one allocated guest
+CPU with `--jobs=1`. Four workloads per anchor cover plain enumeration,
+`--sort=tree` enumeration, enumeration with `-collect:audit`, and content-needle
+matching. These are real CLI workloads, not isolated per-phase benchmarks.
+Fixture and executable identities match before/after. Each of the 24 cells has
+one warmup, nine direct `perf stat` observations and fifty fresh invocations
+under `perf record`: all 1,440 invocations pass the original oracle. Tree-sort
+controls additionally check hierarchical path order. No builds or acceptance
+timings overlap this diagnostic collection; no lost samples are reported.
+
+Plain enumeration's counter medians are:
+
+| Layout |  Files | Task-clock ms | User instructions/file |
+| :----- | -----: | ------------: | ---------------------: |
+| broad  |  20000 |          9.39 |                2556.65 |
+| broad  |  50000 |         27.08 |                2527.67 |
+| broad  | 100000 |         53.39 |                2513.26 |
+| deep   |  20000 |          9.95 |                2547.55 |
+| deep   |  50000 |         27.08 |                2567.81 |
+| deep   | 100000 |         62.65 |                2608.06 |
+
+User instructions per input file stay within approximately 2.5k-2.6k despite
+deep traversal's much larger live heap. That separates the allocation-lifetime
+finding from a claim of an equally large instruction-count discontinuity;
+it does not explain all elapsed-time scaling. At 100k, collection increases
+user instructions from 251.3 to 376.1 million on broad and from 260.8 to 390.0
+million on deep. Tree sorting gives 288.7/366.9 million and content matching
+707.5/730.1 million respectively. These workload differences are not independent
+causal phase costs, nor repeated engine/reference A/B acceptance.
+
+The recording includes its Python repetition driver. Although reports filter
+the `xff` command, their initial printed percentages still use all recorded
+event periods as the denominator. The retained analysis instead sums XFF's
+own leaf periods, including unknown locations, and recomputes all shares.
+Coarse exclusive labels use the named function, not types appearing only in its
+argument list. Directory/metadata, evaluation, allocator, string/memory and
+coordinator helpers all contribute; these sampled labels are not precise wall
+time for traversal, evaluation, collection or output phases.
+
+Raw records contain kernel-context sample IPs even though the recorded event
+attributes say `exclude_kernel=1`. An independent `perf script` check verifies
+all 24 raw sample counts/period sums against the XFF-filtered self histograms;
+kernel-context periods remain explicitly unattributed. Ordinary sampling allows
+location skid, a possible explanation rather than an isolated host diagnosis.
+Counter exclusion and sampled CPU mode have different meanings; see
+[`perf_event_open` semantics](https://man7.org/linux/man-pages/man2/perf_event_open.2.html).
+A `cycles:up` capability probe fails with "No supported events found" on this
+host. No security setting was weakened to obtain symbols. Do not present these
+unattributed samples as kernel CPU time or claim precise per-phase attribution.
+
+The [CPU diagnostic index](benchmarks/native-large-cpu-controls.json) retains
+all cell summaries, executable/fixture identities, recording commands, raw
+counter medians, filtered sample accounting, context checks and limitations.
+The following archives retain all raw counter text, self reports, callgraphs,
+sample-context records, event attributes and reproduction scripts:
+
+- [Broad 20k](benchmarks/native-large-cpu-profiles-broad-20000.json.gz),
+  [50k](benchmarks/native-large-cpu-profiles-broad-50000.json.gz),
+  [100k](benchmarks/native-large-cpu-profiles-broad-100000.json.gz).
+- [Deep 20k](benchmarks/native-large-cpu-profiles-deep-20000.json.gz),
+  [50k](benchmarks/native-large-cpu-profiles-deep-50000.json.gz).
+- Deep 100k: [enumeration](benchmarks/native-large-cpu-profiles-deep-100000-files.json.gz),
+  [tree sorting](benchmarks/native-large-cpu-profiles-deep-100000-files-tree.json.gz),
+  [collection](benchmarks/native-large-cpu-profiles-deep-100000-files-collect.json.gz),
+  [content](benchmarks/native-large-cpu-profiles-deep-100000-content-needle.json.gz).
+
+Deep 100k is partitioned by workload to meet the existing file-size policy
+without discarding report text. All nine archive checksums, raw counter medians,
+sample period/context sums and embedded scripts verify against original artifacts.
+Original `perf.data` and complete base64 oracle arrays remain locally at
+`/tmp/xff-native-large-cpu-profile-session1`; they are not included in the review
+archives. Their hashes and reconstruction commands are retained explicitly.
+The initial local analysis is superseded because it classified functions by
+argument types and did not distinguish kernel-context IPs; the index identifies
+both the superseded and corrected analyses without changing raw observations.
+
+### Workload allocation controls (2026-10-10)
+
+The exact initial-source executable `772994ab7905be77915978f06ea90ae5934aaeef`
+(`f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106`) now has
+allocation profiles for five additional workloads at 20k/50k/100k files on both
+full-grid v2 layouts: tree sorting, explicit collection, lazy stat, eager stat
+and content-needle matching. Thirty Heaptrack profiles and thirty separate
+uninstrumented native-resource controls complete successfully. Every output
+matches its fixture oracle; tree sorting additionally preserves hierarchical
+path order. Native RSS excludes profiler overhead. All invocations use one
+allocated guest CPU and `--jobs=1`; these are not multiworker timing controls.
+
+Lazy metadata uses `-type f -size +0 -print0`; eager metadata uses
+`-size +0 -type f -print0`. The latter starts with an unconditional metadata
+consumer, matching `ExpressionMetadata`'s eager-demand rule. Size oracles are
+derived from actual fixture-model byte lengths; content oracles from those
+bytes' needle membership. Complete maximum-tree hashes and retained
+executable/helper/driver identities match before and after collection. The
+independent verifier regenerates all thirty oracles, checks sixty raw outputs
+and recomputes every allocation/free event and native-resource relationship.
+
+Selected 100k results are below. Byte counts are exact observations, not pooled
+or repeated estimates. Requested intercepted live heap and RSS remain distinct.
+
+| Layout | Workload       | Allocation calls | Peak tracked heap bytes | Native RSS bytes |
+| :----- | :------------- | ---------------: | ----------------------: | ---------------: |
+| broad  | tree sorting   |           220752 |                  330395 |          5976064 |
+| broad  | collection     |           325620 |                26862227 |         32243712 |
+| broad  | lazy stat      |           323947 |                  326963 |          5795840 |
+| broad  | eager stat     |           323949 |                  326963 |          5812224 |
+| broad  | content needle |           357227 |                  327171 |          5799936 |
+| deep   | tree sorting   |           210808 |                35643867 |         41926656 |
+| deep   | collection     |           312881 |                72085451 |         78327808 |
+| deep   | lazy stat      |           310705 |                35658483 |         42143744 |
+| deep   | eager stat     |           310707 |                35659475 |         42049536 |
+| deep   | content needle |           339423 |                35658691 |         41889792 |
+
+The collapsed stack weights sum exactly to every profile's event-count and
+global-peak totals. Exclusive classification tests `EvalCollect` first, then
+`ReadDir::JoinPath`, then `StatEntries` plus `reserve`, then stat path-copy
+helpers, with all remaining weight retained as other. These are stack groups,
+not precise isolated phases or CPU shares. At deep 100k collection's global
+peak, stacks containing `EvalCollect` account for 36,456,976 bytes, directory
+path construction for 25,475,264 and listing reserves for 9,618,816. Broad
+collection stacks account for 26,701,744 of its 26,862,227-byte peak. The deep
+listing/path lifetime finding therefore remains relevant while explicit
+collection adds separate retained records. This does not identify all
+collection bytes as arena storage or justify changing an arena reserve.
+
+Lazy/eager metadata adds allocation calls without a comparable peak increase;
+symbolized stacks include transient `StatFields` string copies. Content also
+adds calls while retaining a similar peak on these fixtures. Neither observation
+establishes CPU cost, storage latency, useful parallelism or remaining-work
+admission. Collection also changes eager metadata demand, so its difference
+cannot be attributed to allocation alone. Warm tmpfs is not slow storage.
+
+The [workload allocation index](benchmarks/native-workload-allocation-controls.json)
+retains all thirty results, full raw-file inventory, compressed/original
+SHA-256 and byte counts, exact source/tree, full grid, command/allocation/helper
+identities and reassembly instructions. Its thirty-five archives preserve all
+360 original per-cell files, including zstd profiles, complete allocation/peak
+stacks, analyzer output, native resources and both raw stdout streams. Identical
+streams are stored once with byte-exact reconstruction references; larger JSON
+payloads use ordered gzip byte chunks under the unchanged 500 KB file-size
+policy. No samples, profile bytes or output records are discarded.
+
+The provenance archive includes frozen driver sources, collection/verification
+logs, independent oracle/event verifier, stack analyzer and lossless export
+verifier. Every reconstructed file matches the original bytes. Native original
+artifacts remain at `/tmp/xff-native-workload-allocation-session1`; executable,
+helper and profiler executable bytes are excluded from the review archives,
+with their retained identities/package provenance recorded. No runtime,
+toolchain, macOS configuration or host security setting changes are included.
+
+The complete audit remains open. Final shared-executor timing must be collected
+after every build has finished, using the complete prepared grid. Repeated
+controls must cover content, eager metadata and slow storage. The six enumeration
+and thirty additional workload allocation cells plus 24 CPU diagnostic cells
+do not complete precise phase-level CPU/slope attribution, candidate-scheduler
+allocation controls, slow storage or native macOS validation.
+Hosted macOS checks provide portability evidence for PR #991;
+they do not replace the specified native M5 Pro A/B and sampling controls for
+the shared-executor experiment.
diff --git a/docs/benchmarks/native-clock-startup-controls.json b/docs/benchmarks/native-clock-startup-controls.json
new file mode 100644
index 00000000000..632afdcc867
--- /dev/null
+++ b/docs/benchmarks/native-clock-startup-controls.json
@@ -0,0 +1,9717 @@
+{
+  "status": "repeated Linux clock mechanism controls; not cross-platform engine acceptance",
+  "raw_archives": [
+    {
+      "name": "native-clock-startup-profiles.json.gz",
+      "sha256": "092b24d8d9b33de82f3945054fdb8afd4ff41210beb866b31258c2a07f798a5d",
+      "bytes": 180086,
+      "raw_json_sha256": "09366dc65d97ca871c89a08af553f7659347daf333e165b694a05e5a96e85c5f"
+    },
+    {
+      "name": "native-clock-startup-timings-1.json.gz",
+      "sha256": "0231a8a96e3aef7f305f110359a66e69487bd0063a9d8c6beee10436881e614f",
+      "bytes": 141008,
+      "raw_json_sha256": "130168ffd8ee9eb7b8b81892f82669a29259cbf2d5e5e4ca7fe19877067ab932"
+    },
+    {
+      "name": "native-clock-startup-timings-2.json.gz",
+      "sha256": "f941094a3fe4c3b1b91b0f19ad5eba1a1be8e9c47b4723134c2ee93fcc50db1b",
+      "bytes": 141101,
+      "raw_json_sha256": "c4fab8d6bbd870a07166008633802576a16a23fd90819a9e6459a80a2c5929ec"
+    },
+    {
+      "name": "native-clock-startup-timings-3.json.gz",
+      "sha256": "ee9b9a96b0ea155adc9c5d0a4669b408b88e15a6f05fbd6d920aa363b56ec68a",
+      "bytes": 155017,
+      "raw_json_sha256": "d33b7bf4f4ed83789f8f014d6d5f5c1aa2302985a4775cae3311b5e008075459"
+    }
+  ],
+  "export_driver_sha256": "3c91baa15270216a6465a65691ab24ab423bc7fb18eed99a854bc197f6ad9477",
+  "timing_analysis": {
+    "status": "verified repeated isolated Linux clock controls; not cross-platform engine acceptance",
+    "verified_at": "2026-10-10T00:59:23.757475+00:00",
+    "manifest": "/tmp/xff-clock-control-repeated-session1/manifest.json",
+    "manifest_sha256": "e1434379d29f96f6999b5a1dc4356d40e6dd917e1e4459b518d1bac7904f600f",
+    "analysis_driver_sha256": "2e0cb50cef2de708f20899326f34c71c208b05f7dab01ccd204bcfbf33d803bf",
+    "source_revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+    "baseline_build": {
+      "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106",
+      "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+      "command": [
+        "/usr/bin/bazelisk",
+        "--nosystem_rc",
+        "--nohome_rc",
+        "build",
+        "--config=clang_release",
+        "--action_env=LD_LIBRARY_PATH=/tmp/xff-icu70/usr/lib/x86_64-linux-gnu",
+        "//xff/cli:xff"
+      ],
+      "source": {
+        "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+        "tree": "a56a093c3fdcb1af6c93fa4cb805cdad724b1707",
+        "clean": true
+      },
+      "artifact": "bazel-out/k8-opt/bin/xff/cli/xff",
+      "configuration": {
+        ".bazelrc": "126e38472aeb6d5e8fab97ab8a15089ec89365c6c42ea24b54683bbbcdb66204",
+        ".bazelversion": "1b9487d55bea47fea50d226cc9c53bc548877ad2a318bac8fbc8b320f429e5c5",
+        "MODULE.bazel": "f3226b43b5a574092398783ac37e208b10456369e35fde70990cd1cbb8399b78",
+        "MODULE.bazel.lock": "e3bef3a20dd7cbe58bd25db54c8ae44398da99034b8d376a92e1c926781e0437",
+        "bazelmod/llvm.MODULE.bazel": "32e3107010f0cace2d07a14634b38e2b0fa9a06b77ece265de2c6a97ed2aaccc"
+      }
+    },
+    "clock_build": {
+      "experiment": "Linux clock-only control, not a historical release build",
+      "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+      "source": {
+        "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+        "tree": "a56a093c3fdcb1af6c93fa4cb805cdad724b1707",
+        "clean": true
+      },
+      "artifact": "bazel-out/k8-opt/bin/xff/cli/xff",
+      "command": [
+        "/usr/bin/bazelisk",
+        "--nosystem_rc",
+        "--nohome_rc",
+        "build",
+        "--config=clang_release",
+        "--copt=-DABSL_USE_UNSCALED_CYCLECLOCK=0",
+        "--host_copt=-DABSL_USE_UNSCALED_CYCLECLOCK=0",
+        "--action_env=LD_LIBRARY_PATH=/tmp/xff-icu70/usr/lib/x86_64-linux-gnu",
+        "--jobs=8",
+        "//xff/cli:xff"
+      ],
+      "sha256": "978f67355a6ebcd7362db1a995e70c143b3abca4de1014daa5d8d003d13c5909",
+      "configuration": {
+        ".bazelrc": "126e38472aeb6d5e8fab97ab8a15089ec89365c6c42ea24b54683bbbcdb66204",
+        ".bazelversion": "1b9487d55bea47fea50d226cc9c53bc548877ad2a318bac8fbc8b320f429e5c5",
+        "MODULE.bazel": "f3226b43b5a574092398783ac37e208b10456369e35fde70990cd1cbb8399b78",
+        "MODULE.bazel.lock": "e3bef3a20dd7cbe58bd25db54c8ae44398da99034b8d376a92e1c926781e0437",
+        "bazelmod/llvm.MODULE.bazel": "32e3107010f0cace2d07a14634b38e2b0fa9a06b77ece265de2c6a97ed2aaccc"
+      },
+      "driver_sha256": "c6326c30b7db3f61f0a7f4dbc73c7d86fa58f7e58c0e132edbcf6a214bf05811",
+      "clock_method": "Abseil optional unscaled cycle clock disabled for all target and exec C++ compilations",
+      "default_configuration_changed": false,
+      "macos_configuration_changed": false
+    },
+    "clock_validation": {
+      "source": {
+        "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+        "tree": "a56a093c3fdcb1af6c93fa4cb805cdad724b1707",
+        "clean": true
+      },
+      "sha256": "978f67355a6ebcd7362db1a995e70c143b3abca4de1014daa5d8d003d13c5909",
+      "test_command": [
+        "/usr/bin/bazelisk",
+        "--nosystem_rc",
+        "--nohome_rc",
+        "test",
+        "--config=clang_release",
+        "--copt=-DABSL_USE_UNSCALED_CYCLECLOCK=0",
+        "--host_copt=-DABSL_USE_UNSCALED_CYCLECLOCK=0",
+        "--action_env=LD_LIBRARY_PATH=/tmp/xff-icu70/usr/lib/x86_64-linux-gnu",
+        "--jobs=8",
+        "//xff/engine:walk_test",
+        "//xff/engine:parallel_match_test",
+        "//xff/engine:run_test",
+        "//xff/engine:rg_test"
+      ],
+      "tests": "passed",
+      "not_performance_acceptance": true
+    },
+    "baseline_retention_verification": {
+      "schema": 1,
+      "method": "sha256-retained-executable",
+      "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106",
+      "measurement_identity": "2f381eb5e5194ae5779dd285a48dccc88d3d2842a8472007fdca6ce85c8cb3fe",
+      "retention_reference": "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+      "verified_at": "2026-10-10T00:34:06.113211+00:00"
+    },
+    "driver_hashes": {
+      "/tmp/xff-clock-control-measure.py": "aacab11c36c1607fab19ba468cf960242cfd9813de38074f25577a58e948ade9",
+      "/tmp/xff-native-resource-accounting/tools/benchmark_compare.py": "3125c9145c69c9f2bd90a273854913dbc41674178b0017a560315f13946196aa",
+      "/tmp/xff-native-resource-accounting/tools/benchmark_fixture.py": "bee7eb2bd51ae7c69ba8df7e923985daf3eb617ab1e43a076cc01152f608c0c0",
+      "/tmp/xff-native-resource-accounting/tools/benchmark_layouts.py": "823cfc115cc2a556fea0c6ce0976caf5b1a58ef0d9d1f371a6f49d2ee4b326db",
+      "/tmp/xff-native-resource-accounting/tools/benchmark_provenance.py": "5cfe87906f4ead07ca8cf00857ed751393cd8d4c8ce0f672bae7ad32f51c96cc",
+      "/tmp/xff-native-resource-accounting/tools/process_resources.py": "8a39146449514c519921ee153f1301621555694b3cf5a64b16edcd6538f5ac16"
+    },
+    "allocation": {
+      "kind": "physical-cores",
+      "cpu_ids": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+      "required": true
+    },
+    "resource_launcher": {
+      "path": "/home/marcus/.cache/bazel/_bazel_marcus/903d84883bded70e9e5965dd7aeb82fa/execroot/_main/bazel-out/k8-opt/bin/tools/process_resources_native",
+      "sha256": "e6766cea6431e91b5a5c1d16746079d59ed0e70bb13bce220e9796d23a09fb89",
+      "memory_method": "native pipeline fork/wait4 v1; native pre-exec footprint included; launcher usage excluded",
+      "wall_method": "monotonic wall time includes native launcher startup, output draining and teardown"
+    },
+    "tools": {
+      "rg": {
+        "status": "available",
+        "path": "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+        "version": "ripgrep 15.2.0 (rev e89fff89ac)\n\nfeatures:+pcre2\nsimd(compile):+SSE2,-SSSE3,-AVX2\nsimd(runtime):+SSE2,+SSSE3,+AVX2\n\nPCRE2 10.45 is available (JIT is available)",
+        "sha256": "e62198eb19b136b88c330af83647b5a962cb99b6b1f066758568f12de1974849"
+      },
+      "find": {
+        "status": "available",
+        "path": "/usr/bin/find",
+        "version": "find (GNU findutils) 4.10.0\nCopyright (C) 2024 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n\nWritten by Eric B. Decker, James Youngman, and Kevin Dalley.\nFeatures enabled: D_TYPE O_NOFOLLOW(enabled) LEAF_OPTIMISATION FTS(FTS_CWDFD) CBO(level=1)",
+        "sha256": "efe4843f166525b02f328f0c456a884d6a597f32d2c78cd615b6be0b64279bcf"
+      },
+      "xff": {
+        "status": "available",
+        "path": "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+        "version": "xff 0.0.0",
+        "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106"
+      },
+      "fzf": {
+        "status": "unavailable"
+      }
+    },
+    "sampling": {
+      "repetitions": 9,
+      "keep": 7,
+      "estimator": "mean fastest seven",
+      "warmup_rounds": 1,
+      "participant_order": "rotate each warmup/sample round",
+      "cache": "full maximum fixtures freshly materialized each session; no flush; reused within session"
+    },
+    "scope": "files on every full-grid anchor; content needle/absent at 5k/20k/50k/100k; no metadata/slow-storage/macOS acceptance",
+    "sessions": [
+      {
+        "path": "/tmp/xff-clock-control-repeated-session1/session-1-ascending/report.json",
+        "sha256": "34cb48b00a6427cfbe49d3cef654653e81f0241e659fa8892015bf37cdd051be",
+        "cells": 126,
+        "order": "ascending",
+        "completed_at": "2026-10-10T00:42:29.784650+00:00",
+        "fixtures": {
+          "broad": {
+            "definition": {
+              "name": "broad",
+              "revision": 2,
+              "fixture_revision": 3,
+              "topology": "shallow fan-out",
+              "files_per_directory": 64,
+              "anchor_prefix": "anchor-",
+              "counts": [
+                10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000,
+                50000, 100000
+              ],
+              "anchor_policy": "nested ascending exact-count roots",
+              "special_entries": "one .gitignore and two symlinks in the smallest anchor",
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+            "tree_sha256": "92a3036334b0182ecbb49f691f859a89c86e3f082a6362e5da210693ecdc6acf",
+            "storage": "verified tmpfs",
+            "initial_verified": true,
+            "final_verified": true
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+              "name": "deep",
+              "revision": 2,
+              "fixture_revision": 3,
+              "topology": "narrow chained groups",
+              "files_per_directory": 512,
+              "anchor_prefix": "anchor-",
+              "counts": [
+                10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000,
+                50000, 100000
+              ],
+              "anchor_policy": "nested ascending exact-count roots",
+              "special_entries": "one .gitignore and two symlinks in the smallest anchor",
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+              }
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+            "tree_sha256": "b068114a81a0192d86f848afe5948606ef435f1cf800d5eb982f89695e3ac83e",
+            "storage": "verified tmpfs",
+            "initial_verified": true,
+            "final_verified": true
+          }
+        },
+        "cells_verified": 126
+      },
+      {
+        "path": "/tmp/xff-clock-control-repeated-session1/session-2-descending/report.json",
+        "sha256": "5a5bcaa0a523f8eab4762e0bb037fe2ccebe7084895290420968986a494141cf",
+        "cells": 126,
+        "order": "descending",
+        "completed_at": "2026-10-10T00:50:52.289084+00:00",
+        "fixtures": {
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+              "name": "broad",
+              "revision": 2,
+              "fixture_revision": 3,
+              "topology": "shallow fan-out",
+              "files_per_directory": 64,
+              "anchor_prefix": "anchor-",
+              "counts": [
+                10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000,
+                50000, 100000
+              ],
+              "anchor_policy": "nested ascending exact-count roots",
+              "special_entries": "one .gitignore and two symlinks in the smallest anchor",
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+              }
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+            "tree_sha256": "92a3036334b0182ecbb49f691f859a89c86e3f082a6362e5da210693ecdc6acf",
+            "storage": "verified tmpfs",
+            "initial_verified": true,
+            "final_verified": true
+          },
+          "deep": {
+            "definition": {
+              "name": "deep",
+              "revision": 2,
+              "fixture_revision": 3,
+              "topology": "narrow chained groups",
+              "files_per_directory": 512,
+              "anchor_prefix": "anchor-",
+              "counts": [
+                10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000,
+                50000, 100000
+              ],
+              "anchor_policy": "nested ascending exact-count roots",
+              "special_entries": "one .gitignore and two symlinks in the smallest anchor",
+              "generator_identity": "8dec9f6185369fe2669f665b7259d374dad65d0a8eca1986b4d1656f2097c36f",
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+                "10": "205dac276ed6e913e499716c507da28ab208d610dfccb0a1528fd3e016b94bdb"
+              }
+            },
+            "root": "/dev/shm/xff-clock-control-_atfq89v/deep",
+            "tree_sha256": "b068114a81a0192d86f848afe5948606ef435f1cf800d5eb982f89695e3ac83e",
+            "storage": "verified tmpfs",
+            "initial_verified": true,
+            "final_verified": true
+          }
+        },
+        "cells_verified": 126
+      },
+      {
+        "path": "/tmp/xff-clock-control-repeated-session1/session-3-seeded-shuffle/report.json",
+        "sha256": "603f6b7fd0c5890aa79bb6c5d962f14bda6828130feec9362464645c4bbe9d8e",
+        "cells": 126,
+        "order": "seeded-shuffle",
+        "completed_at": "2026-10-10T00:59:13.263711+00:00",
+        "fixtures": {
+          "broad": {
+            "definition": {
+              "name": "broad",
+              "revision": 2,
+              "fixture_revision": 3,
+              "topology": "shallow fan-out",
+              "files_per_directory": 64,
+              "anchor_prefix": "anchor-",
+              "counts": [
+                10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000,
+                50000, 100000
+              ],
+              "anchor_policy": "nested ascending exact-count roots",
+              "special_entries": "one .gitignore and two symlinks in the smallest anchor",
+              "generator_identity": "59772f690eb10d1bb936d8b2cdabebe19935eaef332df40307c9a3917cf15696",
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+                "50000": "a36187f596d499ceef4a2f7eca3041d964a70bd7f3ca822609b60b3995338636",
+                "20000": "4af5b9398e25934ff8efa18903f03fda48bef41592320bdc38b1c1b2a6eb5a64",
+                "10000": "9309e2c29a3265de67d97632ec7bbd6ddb6afd3799d88ae6f9459d0d5a55e5a1",
+                "5000": "f61be959a84df3cedd285505ebb39634f879add1c0e612121bb5ec14d6906391",
+                "2000": "22ff6f08aeca75da001db934910a07bfa17830e369cf2296162473ec94440732",
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+      "Per-session estimates are fastest-seven means of nine samples, with one verified warmup.",
+      "Across-session summaries are medians of estimates or ratios, never pooled timing samples.",
+      "Native launch wall boundary differs from historical Python-launch reports.",
+      "These controls do not cover slow storage, eager metadata or macOS performance."
+    ],
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+      "cells_per_session": 126,
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+        "instructions:u": 5960968.0
+      }
+    }
+  ],
+  "startup_profile_scope": {
+    "cells": 36,
+    "correct_fresh_invocations": 7596,
+    "native_analysis_sha256": "36a211993a5552ce3970b4f70450428d9340bfbbf5e98419dceeff4737bee305",
+    "symbolized_calibration_calls": 8
+  },
+  "accounting_helper_retention": {
+    "path": "/tmp/xff-clock-control-repeated-session1/resource-launcher-retained",
+    "sha256": "e6766cea6431e91b5a5c1d16746079d59ed0e70bb13bce220e9796d23a09fb89"
+  },
+  "excluded_large_artifacts": "perf.data and original executables remain at their recorded retention paths; this archive includes their hashes, not their bytes",
+  "cautions": [
+    "Instrumented native counters and trace durations are not accepted wall timings.",
+    "Startup attribution is a one-time Abseil TSC calibration, not per-thread creation.",
+    "Tiny broad-10 single-worker timing regresses about 3.2% by the median of session ratios.",
+    "No default configuration changed; eager metadata, slow storage and native macOS controls remain open."
+  ]
+}
diff --git a/docs/benchmarks/native-clock-startup-profiles.json.gz b/docs/benchmarks/native-clock-startup-profiles.json.gz
new file mode 100644
index 00000000000..b0f68dc31d6
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diff --git a/docs/benchmarks/native-clock-startup-timings-1.json.gz b/docs/benchmarks/native-clock-startup-timings-1.json.gz
new file mode 100644
index 00000000000..1c2f08d13ef
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diff --git a/docs/benchmarks/native-clock-startup-timings-2.json.gz b/docs/benchmarks/native-clock-startup-timings-2.json.gz
new file mode 100644
index 00000000000..66d94630acc
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diff --git a/docs/benchmarks/native-clock-startup-timings-3.json.gz b/docs/benchmarks/native-clock-startup-timings-3.json.gz
new file mode 100644
index 00000000000..d24649fec83
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diff --git a/docs/benchmarks/native-exact-baseline-analysis.json.gz b/docs/benchmarks/native-exact-baseline-analysis.json.gz
new file mode 100644
index 00000000000..d0183474543
Binary files /dev/null and b/docs/benchmarks/native-exact-baseline-analysis.json.gz differ
diff --git a/docs/benchmarks/native-exact-baseline-controls.json b/docs/benchmarks/native-exact-baseline-controls.json
new file mode 100644
index 00000000000..e8b2d200b67
--- /dev/null
+++ b/docs/benchmarks/native-exact-baseline-controls.json
@@ -0,0 +1,1337 @@
+{
+  "status": "verified exact-source full-grid Linux baseline; not repeated A/B or Mac acceptance",
+  "batch": "f586e579b2d57d0f9afa24e6d06849d6bc1df4d96654e5bcb349e77d8c6a9d1d",
+  "source": "772994ab7905be77915978f06ea90ae5934aaeef",
+  "driver": "0e296e40ca6bf523215d80d1dc02deb3503b796c",
+  "binary_sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106",
+  "helper": {
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+    "sha256": "60bcb395bb3d0eccccd0a3d0cb2407538b1f96c45d5e1e156a0bd4522f93328e",
+    "memory_method": "native pipeline fork/wait4 v1; native pre-exec footprint included; launcher usage excluded",
+    "wall_method": "monotonic wall time includes native launcher startup, output draining and teardown"
+  },
+  "contract": {
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+    "depth": 40,
+    "storage": {
+      "parent": "/dev/shm",
+      "filesystem": "tmpfs",
+      "memory_required": true,
+      "scope": "fixture storage only; filesystem syscalls and production VFS remain measured"
+    },
+    "repetitions": 9,
+    "fixture_version": 3,
+    "retained": 7,
+    "estimator": "mean-fastest",
+    "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
+    "machine": "x86_64",
+    "cpu_count": 10,
+    "order": "rotate starting participant by task and round",
+    "warmup_rounds": 1,
+    "cache": "just written, then reused; no flush; discarded correctness-checked warmup round",
+    "output": "NUL paths, unordered multiset; drained pipe; validation after timing",
+    "memory": "single-process peak RSS; pipeline sum of individual peaks is an upper bound, not simultaneous peak",
+    "resource_accounting": {
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+      "memory_method": "native pipeline fork/wait4 v1; native pre-exec footprint included; launcher usage excluded",
+      "wall_method": "monotonic wall time includes native launcher startup, output draining and teardown"
+    },
+    "scope": "batch discovery versus separate precomputed-list filtering; no interactive/ranking equivalence",
+    "environment": "inherited platform environment; isolated HOME; LC_ALL=C; FZF defaults removed; rg config disabled",
+    "children": "direct leaf commands only; no shell or unaccounted subprocess trees",
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+}
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diff --git a/docs/benchmarks/native-large-allocation-controls.json b/docs/benchmarks/native-large-allocation-controls.json
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--- /dev/null
+++ b/docs/benchmarks/native-large-allocation-controls.json
@@ -0,0 +1,842 @@
+{
+  "status": "verified six-cell large allocation diagnostic; full audit remains open",
+  "summary": {
+    "status": "large allocation diagnostic, not performance acceptance",
+    "started_at": "2026-10-10T01:20:02.425823+00:00",
+    "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+    "build": {
+      "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106",
+      "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+      "command": [
+        "/usr/bin/bazelisk",
+        "--nosystem_rc",
+        "--nohome_rc",
+        "build",
+        "--config=clang_release",
+        "--action_env=LD_LIBRARY_PATH=/tmp/xff-icu70/usr/lib/x86_64-linux-gnu",
+        "//xff/cli:xff"
+      ],
+      "source": {
+        "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+        "tree": "a56a093c3fdcb1af6c93fa4cb805cdad724b1707",
+        "clean": true
+      },
+      "artifact": "bazel-out/k8-opt/bin/xff/cli/xff",
+      "configuration": {
+        ".bazelrc": "126e38472aeb6d5e8fab97ab8a15089ec89365c6c42ea24b54683bbbcdb66204",
+        ".bazelversion": "1b9487d55bea47fea50d226cc9c53bc548877ad2a318bac8fbc8b320f429e5c5",
+        "MODULE.bazel": "f3226b43b5a574092398783ac37e208b10456369e35fde70990cd1cbb8399b78",
+        "MODULE.bazel.lock": "e3bef3a20dd7cbe58bd25db54c8ae44398da99034b8d376a92e1c926781e0437",
+        "bazelmod/llvm.MODULE.bazel": "32e3107010f0cace2d07a14634b38e2b0fa9a06b77ece265de2c6a97ed2aaccc"
+      }
+    },
+    "binary_verification": {
+      "schema": 1,
+      "method": "sha256-retained-executable",
+      "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106",
+      "measurement_identity": "2f381eb5e5194ae5779dd285a48dccc88d3d2842a8472007fdca6ce85c8cb3fe",
+      "retention_reference": "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+      "verified_at": "2026-10-10T01:20:02.397586+00:00"
+    },
+    "complete_grid": [
+      10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000, 100000
+    ],
+    "allocation": {
+      "kind": "physical-cores",
+      "cpu_ids": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+      "required": true
+    },
+    "actual_cpu_ids": [0],
+    "workers": 1,
+    "helper": {
+      "path": "/home/marcus/.cache/bazel/_bazel_marcus/903d84883bded70e9e5965dd7aeb82fa/execroot/_main/bazel-out/k8-opt/bin/tools/process_resources_native",
+      "sha256": "60bcb395bb3d0eccccd0a3d0cb2407538b1f96c45d5e1e156a0bd4522f93328e",
+      "memory_method": "native pipeline fork/wait4 v1; native pre-exec footprint included; launcher usage excluded",
+      "wall_method": "monotonic wall time includes native launcher startup, output draining and teardown"
+    },
+    "profiler_bundle": {
+      "purpose": "allocation profiling prerequisite; no performance acceptance",
+      "prepared_at": "2026-10-10T01:15:57.698186+00:00",
+      "root": "/tmp/xff-heaptrack-audit-o8wn542g/root",
+      "system_packages_changed": false,
+      "packages": [
+        {
+          "package": "heaptrack",
+          "version": "1.5.0+dfsg1-6ubuntu1",
+          "metadata": "Package: heaptrack\nPriority: optional\nSection: universe/devel\nInstalled-Size: 370\nMaintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>\nArchitecture: amd64\nVersion: 1.5.0+dfsg1-6ubuntu1\nDepends: libboost-filesystem1.90.0 (>= 1.90.0), libboost-iostreams1.90.0 (>= 1.90.0), libboost-program-options1.90.0 (>= 1.90.0), libc6 (>= 2.34), libgcc-s1 (>= 3.3.1), libstdc++6 (>= 13.1), libheaptrack (= 1.5.0+dfsg1-6ubuntu1)\nFilename: pool/universe/h/heaptrack/heaptrack_1.5.0+dfsg1-6ubuntu1_amd64.deb\nSize: 122656\nMD5sum: 8b202949c78781e41fb420cdcdec521f\nSHA1: 7ce140a220835aed36b20e941b1e308b12406ea3\nSHA256: 16acd77342c449c41ea01feba00780a2438284e75660d29db6f005ff81aec0da\nSHA512: ae6c6914b8c15970901ca9555aa87b44018ab5ad63e9f6e2b78da76fd4639ed214b22877db5b1db544a7c5ebca32b04375f3caa5b8a35695ee8aeecc84ce4058\nHomepage: https://github.com/KDE/heaptrack\nDescription-en: heap memory profiler for Linux\n Heap memory usage profiler. It uses LD_PRELOAD to track all calls\n to the core memory allocation functions and logs these occurrences.\n Additionally, backtraces are obtained and logged. It can also\n generate a historigram of allocation sizes over the number of\n calls. Heaptrack measures the following:\n .\n * Heap memory consumption (like Massif).\n * Number of calls to allocation functions (like callgrind).\n * Total amount of memory allocated, ignoring deallocations.\n * Leaked memory (like memcheck).\n .\n Heaptrack is notable for its ability to attach to running processes,\n for consuming substantially less memory than Valgrind, and for not\n reducing an application's interactivity as much as Valgrind does.\n Heaptrack is useful for debugging memory leaks and memory ballooning.\n .\n The package contains the command line tools.\nDescription-md5: 28555fe7b14b1f0c2fa6813126159c7e\nOriginal-Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>\nOrigin: Ubuntu\nBugs: https://bugs.launchpad.net/ubuntu/+filebug\n\n",
+          "download_command": [
+            "apt-get",
+            "download",
+            "heaptrack=1.5.0+dfsg1-6ubuntu1"
+          ],
+          "path": "/tmp/xff-heaptrack-audit-o8wn542g/packages/heaptrack_1.5.0+dfsg1-6ubuntu1_amd64.deb",
+          "sha256": "16acd77342c449c41ea01feba00780a2438284e75660d29db6f005ff81aec0da"
+        },
+        {
+          "package": "libheaptrack",
+          "version": "1.5.0+dfsg1-6ubuntu1",
+          "metadata": "Package: libheaptrack\nSource: heaptrack\nPriority: optional\nSection: universe/devel\nInstalled-Size: 259\nMaintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>\nArchitecture: amd64\nVersion: 1.5.0+dfsg1-6ubuntu1\nDepends: libc6 (>= 2.38), libdw1t64 (>= 0.158), libgcc-s1 (>= 3.3.1), libstdc++6 (>= 14), libunwind8\nFilename: pool/universe/h/heaptrack/libheaptrack_1.5.0+dfsg1-6ubuntu1_amd64.deb\nSize: 83440\nMD5sum: 76f7b35b0e22485deae34ea9c6b99ebf\nSHA1: 405e5fc337e02d8227a7aa97ad2544e0eea8fe2c\nSHA256: e3c85fb87a9e71bb981fc81d6fc59dad316f8af41e713d42c6e990f48e68c28f\nSHA512: 393ab7a4cb84e7a4c858fb3636c314c9b933ddae50dfe3941baedda300d45cec91cc16da7b9bd40ca8bf8d23aea3908bd37d139829733f64037c9e5ca581a03b\nHomepage: https://github.com/KDE/heaptrack\nDescription-en: heap memory profiler for Linux\n Heap memory usage profiler. It uses LD_PRELOAD to track all calls\n to the core memory allocation functions and logs these occurrences.\n Additionally, backtraces are obtained and logged. It can also\n generate a historigram of allocation sizes over the number of\n calls. Heaptrack measures the following:\n .\n * Heap memory consumption (like Massif).\n * Number of calls to allocation functions (like callgrind).\n * Total amount of memory allocated, ignoring deallocations.\n * Leaked memory (like memcheck).\n .\n Heaptrack is notable for its ability to attach to running processes,\n for consuming substantially less memory than Valgrind, and for not\n reducing an application's interactivity as much as Valgrind does.\n Heaptrack is useful for debugging memory leaks and memory ballooning.\n .\n The package contains the shared libraries.\nDescription-md5: 4ec238360e0c529449af4ecf1315fe84\nOriginal-Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>\nOrigin: Ubuntu\nBugs: https://bugs.launchpad.net/ubuntu/+filebug\n\n",
+          "download_command": [
+            "apt-get",
+            "download",
+            "libheaptrack=1.5.0+dfsg1-6ubuntu1"
+          ],
+          "path": "/tmp/xff-heaptrack-audit-o8wn542g/packages/libheaptrack_1.5.0+dfsg1-6ubuntu1_amd64.deb",
+          "sha256": "e3c85fb87a9e71bb981fc81d6fc59dad316f8af41e713d42c6e990f48e68c28f"
+        },
+        {
+          "package": "libboost-filesystem1.90.0",
+          "version": "1.90.0-6ubuntu1",
+          "metadata": "Package: libboost-filesystem1.90.0\nSource: boost1.90\nPriority: optional\nSection: libs\nInstalled-Size: 2230\nMaintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>\nArchitecture: amd64\nVersion: 1.90.0-6ubuntu1\nDepends: libc6 (>= 2.38), libgcc-s1 (>= 3.3.1), libstdc++6 (>= 5.2)\nFilename: pool/main/b/boost1.90/libboost-filesystem1.90.0_1.90.0-6ubuntu1_amd64.deb\nSize: 282578\nMD5sum: 1fcd4b29e81bc84adeaf3221c1f9d185\nSHA1: acfa0305ec48f5836b1cab0b9aec81a16f637e8d\nSHA256: 3f78b71bf3bcaf465ee3010a7fd09e0374a1e3be040b4520a71466788f1fa93b\nSHA512: 937a4613099cc92daccda9a19c708a6f3f4d14da69721e5aee05570f45028d2e58833e45d07cbda0445791f6660c5bd31484ab86a131d710f50b70da945d9e0a\nHomepage: http://boost.org/libs/filesystem/\nDescription-en: filesystem operations (portable paths, iteration over directories, etc) in C++\n This package forms part of the Boost C++ Libraries collection.\n .\n The Boost Filesystem Library provides portable facilities to query and\n manipulate paths, files, and directories.  The goal is to\n facilitate portable script-like operations from within C++ programs.\nDescription-md5: 2491b00e1306a35046eca365dc71ba1d\nOriginal-Maintainer: Debian Boost Team <team+boost@tracker.debian.org>\nMulti-Arch: same\nOrigin: Ubuntu\nBugs: https://bugs.launchpad.net/ubuntu/+filebug\nTask: kubuntu-desktop, kubuntu-full, ubuntustudio-desktop, ubuntustudio-desktop-core, edubuntu-desktop-gnome, edubuntu-desktop-gnome-raspi\n\n",
+          "download_command": [
+            "apt-get",
+            "download",
+            "libboost-filesystem1.90.0=1.90.0-6ubuntu1"
+          ],
+          "path": "/tmp/xff-heaptrack-audit-o8wn542g/packages/libboost-filesystem1.90.0_1.90.0-6ubuntu1_amd64.deb",
+          "sha256": "3f78b71bf3bcaf465ee3010a7fd09e0374a1e3be040b4520a71466788f1fa93b"
+        },
+        {
+          "package": "libboost-iostreams1.90.0",
+          "version": "1.90.0-6ubuntu1",
+          "metadata": "Package: libboost-iostreams1.90.0\nSource: boost1.90\nPriority: optional\nSection: libs\nInstalled-Size: 2166\nMaintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>\nArchitecture: amd64\nVersion: 1.90.0-6ubuntu1\nDepends: libbz2-1.0, libc6 (>= 2.34), libgcc-s1 (>= 3.3.1), liblzma5 (>= 5.2.2), libstdc++6 (>= 5.2), libzstd1 (>= 1.5.5), zlib1g (>= 1:1.1.4)\nFilename: pool/main/b/boost1.90/libboost-iostreams1.90.0_1.90.0-6ubuntu1_amd64.deb\nSize: 252674\nMD5sum: 779f0c83eb34f874b65ca2b422e32b0b\nSHA1: 5c9db7d0e22ce6012ff3bf51fa55aa2182cdcc01\nSHA256: f2b4576e6b61d636874c09e6e84bcc3632fdde9eef808ca9eff5d5904dee2948\nSHA512: 61b6498d1caf4644ae0fd141dc9794bbd1ff3fa77f8b88326a93a3a367d27b1e6c6e0f1255509b1e0ebe36a08c71f26b8e0c909623e9f35cfa01c732b09988a5\nHomepage: http://www.boost.org/libs/iostreams/\nDescription-en: Boost.Iostreams Library\n This package forms part of the Boost C++ Libraries collection.\n .\n Boost.Iostreams are a collection of concepts and a set of templates\n which turn models of these concepts into C++ standard library streams\n and stream buffers.\nDescription-md5: 3c388d3a296c3c5ceb93d6073902d96e\nOriginal-Maintainer: Debian Boost Team <team+boost@tracker.debian.org>\nMulti-Arch: same\nOrigin: Ubuntu\nBugs: https://bugs.launchpad.net/ubuntu/+filebug\nTask: ubuntu-desktop, ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, ubuntu-desktop-default-languages, kubuntu-desktop, kubuntu-full, xubuntu-desktop, lubuntu-desktop-minimal, lubuntu-desktop, ubuntustudio-desktop, ubuntukylin-desktop, ubuntukylin-desktop, ubuntukylin-desktop-minimal, ubuntu-mate-core, ubuntu-mate-desktop, ubuntu-budgie-desktop, ubuntu-budgie-desktop-default-languages, ubuntu-budgie-desktop-raspi, ubuntu-unity-desktop, edubuntu-desktop-gnome, edubuntu-desktop-gnome-raspi, ubuntucinnamon-desktop-minimal, ubuntucinnamon-desktop, ubuntucinnamon-desktop, ubuntucinnamon-desktop-raspi\n\n",
+          "download_command": [
+            "apt-get",
+            "download",
+            "libboost-iostreams1.90.0=1.90.0-6ubuntu1"
+          ],
+          "path": "/tmp/xff-heaptrack-audit-o8wn542g/packages/libboost-iostreams1.90.0_1.90.0-6ubuntu1_amd64.deb",
+          "sha256": "f2b4576e6b61d636874c09e6e84bcc3632fdde9eef808ca9eff5d5904dee2948"
+        },
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+          "version": "1.90.0-6ubuntu1",
+          "metadata": "Package: libboost-program-options1.90.0\nSource: boost1.90\nPriority: optional\nSection: libs\nInstalled-Size: 2342\nMaintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>\nArchitecture: amd64\nVersion: 1.90.0-6ubuntu1\nDepends: libc6 (>= 2.14), libgcc-s1 (>= 3.3.1), libstdc++6 (>= 13.1)\nFilename: pool/main/b/boost1.90/libboost-program-options1.90.0_1.90.0-6ubuntu1_amd64.deb\nSize: 315412\nMD5sum: 3b2012b925c36e6ecc425fc64bb45208\nSHA1: f9419a4a5638a8e82a5515a5747d7241aa87ae56\nSHA256: 552699d9211d5e9bc6c2ff97c412a901b431ba61eb7d93c8c139c3d20f45104e\nSHA512: 20b4e187af1f4aa2442f00dbc0097e7cdddca0127b02801b884412786798e2cd21deeff34c510979cc4b2c481f0194ff26d68118e9344a27bac2701e293add39\nHomepage: http://www.boost.org/libs/program_options/\nDescription-en: program options library for C++\n This package forms part of the Boost C++ Libraries collection.\n .\n Library to let program developers obtain program options, that is\n (name, value) pairs from the user, via conventional methods such as\n command line and config file.\nDescription-md5: 9ab9e15257fa51221c16c7f0a9e40597\nOriginal-Maintainer: Debian Boost Team <team+boost@tracker.debian.org>\nMulti-Arch: same\nOrigin: Ubuntu\nBugs: https://bugs.launchpad.net/ubuntu/+filebug\nTask: kubuntu-desktop, kubuntu-full, ubuntustudio-desktop, ubuntustudio-desktop-core\n\n",
+          "download_command": [
+            "apt-get",
+            "download",
+            "libboost-program-options1.90.0=1.90.0-6ubuntu1"
+          ],
+          "path": "/tmp/xff-heaptrack-audit-o8wn542g/packages/libboost-program-options1.90.0_1.90.0-6ubuntu1_amd64.deb",
+          "sha256": "552699d9211d5e9bc6c2ff97c412a901b431ba61eb7d93c8c139c3d20f45104e"
+        }
+      ],
+      "script_sha256": "c9d7fb63d750738d5fe56994705108217f5044bd3112d4053f0bd95b46850ba8"
+    },
+    "profiler_control": {
+      "status": "verified allocation-interposition prerequisite, not xff performance acceptance",
+      "verified_at": "2026-10-10T01:17:55.092781+00:00",
+      "command": [
+        "/tmp/xff-heaptrack-audit-o8wn542g/root/usr/bin/heaptrack",
+        "--record-only",
+        "--output",
+        "/tmp/xff-heaptrack-audit-o8wn542g/allocation-control-verified",
+        "/tmp/xff-heaptrack-audit-o8wn542g/allocation-control"
+      ],
+      "analysis_command": [
+        "/tmp/xff-heaptrack-audit-o8wn542g/root/usr/bin/heaptrack_print",
+        "--file",
+        "/tmp/xff-heaptrack-audit-o8wn542g/allocation-control-verified.zst",
+        "--merge-backtraces=0",
+        "--print-flamegraph",
+        "/tmp/xff-heaptrack-audit-o8wn542g/allocation-control-verified.allocations.stacks",
+        "--flamegraph-cost-type",
+        "allocations"
+      ],
+      "environment_overrides": {
+        "LD_LIBRARY_PATH": "/tmp/xff-heaptrack-audit-o8wn542g/root/usr/lib/x86_64-linux-gnu"
+      },
+      "correctness_stdout": "allocation-control-ok",
+      "allocation_calls": 5,
+      "controlled_allocation_calls": 3,
+      "tracked_peak_heap_bytes": 6365184,
+      "controlled_peak_heap_bytes": 6291456,
+      "known_runtime_startup_bytes": 73728,
+      "allocation_sizes": [73728, 1048576, 2097152, 4194304, 4096],
+      "remaining_stdout_buffer_bytes": 4096,
+      "source_sha256": "1a239e55666c88ba40166a029463e144c98cd10b94f3b5ccb1fcbd1b53b50c2d",
+      "binary_sha256": "d6a6c52c5e8eb9b144abd2899dd9c5d9d4725401c311b241506190893418af8e",
+      "profile": "/tmp/xff-heaptrack-audit-o8wn542g/allocation-control-verified.zst",
+      "profile_sha256": "4d26c2a91738b72279a9b5d6b0176ba5a5772058ca2eb9d47b107154b37a578d",
+      "cautions": [
+        "Instrumented wall times are not accepted benchmark timings.",
+        "Tracked requested heap bytes differ from RSS and exclude non-intercepted allocation mechanisms.",
+        "Short-process periodic RSS/Massif snapshots can miss the actual allocation peak; use event accounting.",
+        "Xff 20k/50k/100k allocation and slope profiles have not yet been collected."
+      ]
+    },
+    "driver_sha256": "eb9e27b292a5da92669519cbcac653716518b8912dfdfde2ee8f766c0d0e8b52",
+    "driver_sources": {
+      "/tmp/xff-native-startup-profiles.py": "fd0fbd1ee46b4bf5ec51969052c4a86202525d7d93d31cfb91964246464b3e77",
+      "/tmp/xff-shared-run-executor/tools/benchmark_layouts.py": "823cfc115cc2a556fea0c6ce0976caf5b1a58ef0d9d1f371a6f49d2ee4b326db",
+      "/tmp/xff-shared-run-executor/tools/benchmark_fixture.py": "bee7eb2bd51ae7c69ba8df7e923985daf3eb617ab1e43a076cc01152f608c0c0",
+      "/tmp/xff-shared-run-executor/tools/benchmark_compare.py": "5a55fbc8d0955e701fd4314441e345a2edd49b9eb4f7f3d3963055e6380f233b",
+      "/tmp/xff-shared-run-executor/tools/benchmark_provenance.py": "5cfe87906f4ead07ca8cf00857ed751393cd8d4c8ce0f672bae7ad32f51c96cc",
+      "/tmp/xff-native-resource-accounting/tools/process_resources.py": "8a39146449514c519921ee153f1301621555694b3cf5a64b16edcd6538f5ac16"
+    },
+    "scope": "enumeration only; 20k/50k/100k, both full-grid v2 layouts; one profile and native RSS control per cell",
+    "cautions": [
+      "No instrumented elapsed time is acceptance evidence.",
+      "Tracked heap excludes non-interposed allocation mechanisms and is not RSS.",
+      "Peak RSS is obtained independently without heaptrack; one observation is diagnostic.",
+      "Content, metadata, slow-storage and native macOS allocation controls remain open."
+    ],
+    "fixtures": {
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+    }
+  ],
+  "verifications": [
+    "original raw profile hashes",
+    "native RSS control hashes",
+    "allocation events recomputed",
+    "all allocation flamegraph weights",
+    "all global-peak flamegraph weights"
+  ],
+  "export_driver_sha256": "62ef44894c1e7366b287b73547f4e0cb53689d60102e0c01f283c46cda3bc958"
+}
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diff --git a/docs/benchmarks/native-large-cpu-controls.json b/docs/benchmarks/native-large-cpu-controls.json
new file mode 100644
index 00000000000..7e8d2794387
--- /dev/null
+++ b/docs/benchmarks/native-large-cpu-controls.json
@@ -0,0 +1,7832 @@
+{
+  "status": "verified 24-cell CPU diagnostics; not timing acceptance or precise phase attribution",
+  "summary": {
+    "status": "completed large-grid CPU diagnostics, not acceptance timings",
+    "started_at": "2026-10-10T01:31:34.501911+00:00",
+    "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
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+      "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+      "command": [
+        "/usr/bin/bazelisk",
+        "--nosystem_rc",
+        "--nohome_rc",
+        "build",
+        "--config=clang_release",
+        "--action_env=LD_LIBRARY_PATH=/tmp/xff-icu70/usr/lib/x86_64-linux-gnu",
+        "//xff/cli:xff"
+      ],
+      "source": {
+        "revision": "4ea895f63106f05df7c90b629d20433ae1e03016",
+        "tree": "a56a093c3fdcb1af6c93fa4cb805cdad724b1707",
+        "clean": true
+      },
+      "artifact": "bazel-out/k8-opt/bin/xff/cli/xff",
+      "configuration": {
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+        ".bazelversion": "1b9487d55bea47fea50d226cc9c53bc548877ad2a318bac8fbc8b320f429e5c5",
+        "MODULE.bazel": "f3226b43b5a574092398783ac37e208b10456369e35fde70990cd1cbb8399b78",
+        "MODULE.bazel.lock": "e3bef3a20dd7cbe58bd25db54c8ae44398da99034b8d376a92e1c926781e0437",
+        "bazelmod/llvm.MODULE.bazel": "32e3107010f0cace2d07a14634b38e2b0fa9a06b77ece265de2c6a97ed2aaccc"
+      }
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+    "binary_verification": {
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+      "method": "sha256-retained-executable",
+      "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106",
+      "measurement_identity": "2f381eb5e5194ae5779dd285a48dccc88d3d2842a8472007fdca6ce85c8cb3fe",
+      "retention_reference": "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+      "verified_at": "2026-10-10T01:31:34.473974+00:00"
+    },
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+    "stat_repetitions": 9,
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+    "profile_scope": "record includes Python oracle loop; reports filter comm=xff; self periods are user-cycle samples, not wall shares",
+    "environment_overrides": {
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+      "TZ": "UTC",
+      "NO_COLOR": "1"
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+    "driver_sha256": "f849b9f346fa7792285bcccae4b810598fb2fe41c083e6c0c3a1aad3e3efdc5a",
+    "driver_sources": {
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+      "/tmp/xff-shared-run-executor/tools/benchmark_compare.py": "5a55fbc8d0955e701fd4314441e345a2edd49b9eb4f7f3d3963055e6380f233b",
+      "/tmp/xff-shared-run-executor/tools/benchmark_layouts.py": "823cfc115cc2a556fea0c6ce0976caf5b1a58ef0d9d1f371a6f49d2ee4b326db",
+      "/tmp/xff-shared-run-executor/tools/benchmark_fixture.py": "bee7eb2bd51ae7c69ba8df7e923985daf3eb617ab1e43a076cc01152f608c0c0",
+      "/tmp/xff-shared-run-executor/tools/benchmark_provenance.py": "5cfe87906f4ead07ca8cf00857ed751393cd8d4c8ce0f672bae7ad32f51c96cc"
+    },
+    "scope": "both full-grid v2 layouts, 20k/50k/100k, jobs1; files, files-tree, files-collect, content-needle",
+    "cautions": [
+      "No instrumented wall time is an acceptance estimate.",
+      "User-cycle samples exclude kernel CPU and blocked I/O; direct stat counters retain total task clock.",
+      "Collection is a real CLI action, not a claim to isolate allocation from every other changed phase.",
+      "Deep stacks may exceed the DWARF capture limit; retain raw samples and report unknowns.",
+      "No scheduler change or cross-platform acceptance is measured here."
+    ],
+    "fixtures": {
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+        "tree_sha256": "92a3036334b0182ecbb49f691f859a89c86e3f082a6362e5da210693ecdc6acf",
+        "definition": {
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+          "topology": "shallow fan-out",
+          "files_per_directory": 64,
+          "anchor_prefix": "anchor-",
+          "counts": [
+            10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000,
+            100000
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+          "special_entries": "one .gitignore and two symlinks in the smallest anchor",
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+        "storage": "verified tmpfs",
+        "final_verified": true
+      },
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+        "tree_sha256": "b068114a81a0192d86f848afe5948606ef435f1cf800d5eb982f89695e3ac83e",
+        "definition": {
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+          "revision": 2,
+          "fixture_revision": 3,
+          "topology": "narrow chained groups",
+          "files_per_directory": 512,
+          "anchor_prefix": "anchor-",
+          "counts": [
+            10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000, 50000,
+            100000
+          ],
+          "anchor_policy": "nested ascending exact-count roots",
+          "special_entries": "one .gitignore and two symlinks in the smallest anchor",
+          "generator_identity": "8dec9f6185369fe2669f665b7259d374dad65d0a8eca1986b4d1656f2097c36f",
+          "anchor_hashes": {
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+            "10": "205dac276ed6e913e499716c507da28ab208d610dfccb0a1528fd3e016b94bdb"
+          }
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+        "storage": "verified tmpfs",
+        "final_verified": true
+      }
+    },
+    "cases": [
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+        "label": "broad-20000-jobs1-files",
+        "dataset": "broad",
+        "files": 20000,
+        "workers": 1,
+        "task": "files",
+        "command": [
+          "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+          "--no-config",
+          "--no-pager",
+          "--color=never",
+          "--jobs=1",
+          "--sort=none",
+          "--exact",
+          "--case=sensitive",
+          "--gitignore=off",
+          "--hidden",
+          ".",
+          "-type",
+          "f",
+          "-print0"
+        ],
+        "cwd": "/dev/shm/xff-large-cpu-sge617t7/broad/anchor-100000/anchor-50000/anchor-20000",
+        "cpu_ids": [0],
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+        "expected_count": 20000,
+        "stat_command": [
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+          "-c",
+          "0",
+          "perf",
+          "stat",
+          "-x",
+          ";",
+          "-e",
+          "task-clock,context-switches,page-faults,cycles:u,instructions:u",
+          "--",
+          "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+          "--no-config",
+          "--no-pager",
+          "--color=never",
+          "--jobs=1",
+          "--sort=none",
+          "--exact",
+          "--case=sensitive",
+          "--gitignore=off",
+          "--hidden",
+          ".",
+          "-type",
+          "f",
+          "-print0"
+        ],
+        "record_command": [
+          "taskset",
+          "-c",
+          "0",
+          "perf",
+          "record",
+          "-e",
+          "cycles:u",
+          "-F",
+          "1999",
+          "--call-graph",
+          "dwarf,16384",
+          "-o",
+          "/tmp/xff-native-large-cpu-profile-session1/broad-20000-jobs1-files/perf.data",
+          "--",
+          "/usr/bin/python3.13",
+          "/tmp/xff-native-large-cpu-profiles.py",
+          "--repeat-command",
+          "/tmp/xff-native-large-cpu-profile-session1/broad-20000-jobs1-files/command.json"
+        ],
+        "report_commands": {
+          "stacks": [
+            "perf",
+            "report",
+            "--stdio",
+            "--stdio-color",
+            "never",
+            "--comms",
+            "xff",
+            "--percent-limit",
+            "0.5",
+            "-g",
+            "graph,0.5,caller",
+            "-i",
+            "/tmp/xff-native-large-cpu-profile-session1/broad-20000-jobs1-files/perf.data"
+          ],
+          "self": [
+            "perf",
+            "report",
+            "--stdio",
+            "--stdio-color",
+            "never",
+            "--comms",
+            "xff",
+            "--no-children",
+            "--percent-limit",
+            "0",
+            "-g",
+            "none",
+            "--fields",
+            "overhead,period,symbol,dso",
+            "--sort",
+            "symbol,dso",
+            "--field-separator",
+            ";",
+            "-i",
+            "/tmp/xff-native-large-cpu-profile-session1/broad-20000-jobs1-files/perf.data"
+          ]
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+      "named_leaf_groups": [
+        {
+          "category": "other/unattributed",
+          "period": 2503640972,
+          "xff_self_percent": 22.735842705891255
+        },
+        {
+          "category": "expression/evaluation helpers",
+          "period": 1830357809,
+          "xff_self_percent": 16.62168326302808
+        },
+        {
+          "category": "kernel-context sample/not attributed",
+          "period": 1103573001,
+          "xff_self_percent": 10.02166941898264
+        },
+        {
+          "category": "generic string/memory helpers",
+          "period": 1070997251,
+          "xff_self_percent": 9.72584540255636
+        },
+        {
+          "category": "generic allocator helpers",
+          "period": 911938581,
+          "xff_self_percent": 8.281415892665647
+        },
+        {
+          "category": "coordinator/visitor bridge",
+          "period": 909445312,
+          "xff_self_percent": 8.25877423899348
+        },
+        {
+          "category": "directory/metadata boundary",
+          "period": 872457066,
+          "xff_self_percent": 7.922879854603763
+        },
+        {
+          "category": "collection/arena helpers",
+          "period": 866290349,
+          "xff_self_percent": 7.86687921022553
+        },
+        {
+          "category": "walker/entry helpers",
+          "period": 821110375,
+          "xff_self_percent": 7.456594830872333
+        },
+        {
+          "category": "output/effect helpers",
+          "period": 115923876,
+          "xff_self_percent": 1.0527176380596643
+        },
+        {
+          "category": "matching/content helpers",
+          "period": 6133340,
+          "xff_self_percent": 0.05569754412125472
+        }
+      ],
+      "total_xff_samples": 23067,
+      "context_samples": {
+        "U": 20734,
+        "K": 2333
+      }
+    },
+    {
+      "case": {
+        "label": "deep-100000-jobs1-content-needle",
+        "dataset": "deep",
+        "files": 100000,
+        "workers": 1,
+        "task": "content-needle",
+        "command": [
+          "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+          "--no-config",
+          "--no-pager",
+          "--color=never",
+          "--jobs=1",
+          "--sort=none",
+          "--exact",
+          "--case=sensitive",
+          "--gitignore=off",
+          "--hidden",
+          ".",
+          "-type",
+          "f",
+          "--regextype=EXACT",
+          "-rxc",
+          "needle",
+          "-print0"
+        ],
+        "cwd": "/dev/shm/xff-large-cpu-sge617t7/deep/anchor-100000",
+        "cpu_ids": [0],
+        "ordered": false,
+        "anchor_sha256": "9731240885346bcb0713350db55c1eda635a814bd55e23a8fead2a0a2697b450",
+        "expected_sha256": "a9c632078fdc8767fb57cb56e75186e1d707216b2586af8a1d1cf57ee3efd45e",
+        "expected_count": 33333,
+        "stat_command": [
+          "taskset",
+          "-c",
+          "0",
+          "perf",
+          "stat",
+          "-x",
+          ";",
+          "-e",
+          "task-clock,context-switches,page-faults,cycles:u,instructions:u",
+          "--",
+          "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+          "--no-config",
+          "--no-pager",
+          "--color=never",
+          "--jobs=1",
+          "--sort=none",
+          "--exact",
+          "--case=sensitive",
+          "--gitignore=off",
+          "--hidden",
+          ".",
+          "-type",
+          "f",
+          "--regextype=EXACT",
+          "-rxc",
+          "needle",
+          "-print0"
+        ],
+        "record_command": [
+          "taskset",
+          "-c",
+          "0",
+          "perf",
+          "record",
+          "-e",
+          "cycles:u",
+          "-F",
+          "1999",
+          "--call-graph",
+          "dwarf,16384",
+          "-o",
+          "/tmp/xff-native-large-cpu-profile-session1/deep-100000-jobs1-content-needle/perf.data",
+          "--",
+          "/usr/bin/python3.13",
+          "/tmp/xff-native-large-cpu-profiles.py",
+          "--repeat-command",
+          "/tmp/xff-native-large-cpu-profile-session1/deep-100000-jobs1-content-needle/command.json"
+        ],
+        "report_commands": {
+          "stacks": [
+            "perf",
+            "report",
+            "--stdio",
+            "--stdio-color",
+            "never",
+            "--comms",
+            "xff",
+            "--percent-limit",
+            "0.5",
+            "-g",
+            "graph,0.5,caller",
+            "-i",
+            "/tmp/xff-native-large-cpu-profile-session1/deep-100000-jobs1-content-needle/perf.data"
+          ],
+          "self": [
+            "perf",
+            "report",
+            "--stdio",
+            "--stdio-color",
+            "never",
+            "--comms",
+            "xff",
+            "--no-children",
+            "--percent-limit",
+            "0",
+            "-g",
+            "none",
+            "--fields",
+            "overhead,period,symbol,dso",
+            "--sort",
+            "symbol,dso",
+            "--field-separator",
+            ";",
+            "-i",
+            "/tmp/xff-native-large-cpu-profile-session1/deep-100000-jobs1-content-needle/perf.data"
+          ]
+        },
+        "correct_fresh_invocations": 60,
+        "stat_sha256": "e64090967efc870f75f0f7336cfd7e152579fe032b0bfd9639e2179fc4cb3dbe",
+        "perf_data_sha256": "6ef1dd6e222a2acf6d08db193631816737f2f53d1d23ab3f6f22841998d17667",
+        "self_report_sha256": "f56e9d9f79ab91d856e39a6fcce8875c772c63a30e43f9803547439f1625d9e8",
+        "stacks_sha256": "4bd19741bf2254742012632804db11fa0d8a6c47eb67b1e845bd2afe6dfa8b2e"
+      },
+      "counter_medians": {
+        "task-clock": 270.39,
+        "context-switches": 1.0,
+        "page-faults": 9146.0,
+        "cycles:u": 386333284.0,
+        "instructions:u": 730100542.0
+      },
+      "instructions_per_input_file": 7301.00542,
+      "task_clock_ms_per_input_file": 0.0027039,
+      "xff_filtered_self_period": 20719771723,
+      "kernel_context_fraction": 0.12902956421244352,
+      "lost_samples": 0,
+      "named_leaf_groups": [
+        {
+          "category": "generic string/memory helpers",
+          "period": 6163940723,
+          "xff_self_percent": 29.749076415536532
+        },
+        {
+          "category": "other/unattributed",
+          "period": 3978283111,
+          "xff_self_percent": 19.200419600105455
+        },
+        {
+          "category": "kernel-context sample/not attributed",
+          "period": 2673463116,
+          "xff_self_percent": 12.902956421244353
+        },
+        {
+          "category": "expression/evaluation helpers",
+          "period": 2557481979,
+          "xff_self_percent": 12.343195732031473
+        },
+        {
+          "category": "coordinator/visitor bridge",
+          "period": 1634972099,
+          "xff_self_percent": 7.890878919216556
+        },
+        {
+          "category": "generic allocator helpers",
+          "period": 1451731821,
+          "xff_self_percent": 7.0065048998030415
+        },
+        {
+          "category": "walker/entry helpers",
+          "period": 1195644701,
+          "xff_self_percent": 5.770549584157695
+        },
+        {
+          "category": "directory/metadata boundary",
+          "period": 918311027,
+          "xff_self_percent": 4.432051854995237
+        },
+        {
+          "category": "output/effect helpers",
+          "period": 75302801,
+          "xff_self_percent": 0.36343451079825395
+        },
+        {
+          "category": "matching/content helpers",
+          "period": 70640345,
+          "xff_self_percent": 0.3409320621114065
+        }
+      ],
+      "total_xff_samples": 33800,
+      "context_samples": {
+        "U": 29336,
+        "K": 4464
+      }
+    }
+  ],
+  "precise_sampling_capability_probe": {
+    "command": ["perf", "stat", "-e", "cycles:up", "--", "/bin/true"],
+    "exit_code": 1,
+    "stdout": "",
+    "stderr": "Error:\nNo supported events found.\n'precise' request may not be supported. Try removing 'p' modifier.\n"
+  },
+  "cautions": [
+    "Printed perf percentages use all recorded user cycles, including Python; recomputed shares use only Xff self periods.",
+    "cycles:u counters exclude kernel cycles, but recorded kernel-context sample IPs remain in their own unattributed category; sample-location skid is not kernel CPU attribution.",
+    "Task-clock and instruction counters are separate direct-process diagnostics; no sample share measures blocked I/O or wall time.",
+    "Named leaf groups are coarse exclusive symbol rules, not causal phase attribution; generic libraries remain separate.",
+    "No overhead-contaminated counter or profile duration is an accepted wall-time estimate.",
+    "Sorted and collected CLI variants are real controls, not isolated microbenchmarks.",
+    "Raw callchains can truncate at the recorded DWARF stack limit; unknown samples remain in the denominator.",
+    "Kernel-context IPs are recorded despite exclude_kernel=1; retain them as unattributed.",
+    "A user-cycle counter exclusion is not proof that every sampled IP is in user context.",
+    "Ordinary PMU sampling permits location skid; this is a possible explanation, not an isolated kernel/PMU diagnosis.",
+    "No security or kernel setting is changed."
+  ],
+  "excluded_artifacts": "original perf.data and complete command.json oracle arrays remain at recorded local paths; archives retain hashes and commands, full-grid models and reproduction scripts",
+  "supersedes_local_analysis": {
+    "path": "/tmp/xff-native-large-cpu-analysis.json",
+    "sha256": "5780fd1752eaeebded4bebbb748455dd511d86a6eed3a373971e7df296535513",
+    "reason": "separate kernel-context sample IPs; classify named symbols before argument types; raw observations unchanged"
+  },
+  "export_driver_sha256": "fcde8c5fce37bddaf2c45e62765f425666252806e7e7228ab255be3ff6c5b88b"
+}
diff --git a/docs/benchmarks/native-large-cpu-profiles-broad-100000.json.gz b/docs/benchmarks/native-large-cpu-profiles-broad-100000.json.gz
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diff --git a/docs/benchmarks/native-large-cpu-profiles-deep-100000-files-tree.json.gz b/docs/benchmarks/native-large-cpu-profiles-deep-100000-files-tree.json.gz
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diff --git a/docs/benchmarks/native-linux-host-context.json b/docs/benchmarks/native-linux-host-context.json
new file mode 100644
index 00000000000..af29f388ef4
--- /dev/null
+++ b/docs/benchmarks/native-linux-host-context.json
@@ -0,0 +1,85 @@
+{
+  "schema_version": 1,
+  "status": "post-start measurement-environment observation; not historical host pinning proof",
+  "observed_at": "2026-10-10T09:36:42+00:00",
+  "source_manifest_sha256": "175eec896d2bbe4812a33e296a24e6a2dce153430582502a124126f7c512163b",
+  "limitations": [
+    "Observation postdates earlier collections; it is not historical host-state proof.",
+    "Guest CPU topology and affinity do not establish host physical-core pinning.",
+    "QEMU disk backing and physical-storage latency are not established.",
+    "Both /tmp and /dev/shm are tmpfs; neither supplies a slow-storage control.",
+    "Original reports and their field names remain unchanged."
+  ],
+  "source_manifest": {
+    "status": "post-start measurement-environment observation; not historical host pinning proof",
+    "observed_at": "2026-10-10T09:36:42+00:00",
+    "sources": {
+      "observed_at": {
+        "path": "/tmp/xff-scheduler-host-context-observed-at.txt",
+        "sha256": "ca377dbfc10823cc81358a42378f08ea63fe3d2b5509bee6fc9970e52272eff0"
+      },
+      "lscpu": {
+        "path": "/tmp/xff-scheduler-host-lscpu.json",
+        "sha256": "56f9949339746e00e0b655e96d0acaf2748052517a35f670f3556c5da6a4df97"
+      },
+      "core_topology": {
+        "path": "/tmp/xff-scheduler-host-core-topology.json",
+        "sha256": "70da0bc6cc8ce561b46af772450e3bba4a653851116c86926e4b703b681d27ad"
+      },
+      "virtualization": {
+        "path": "/tmp/xff-scheduler-host-virtualization.txt",
+        "sha256": "3b691b22d6a04e2c63061f30b8d26048dc13d891ab7a9633a212a327b25c72fc"
+      },
+      "workspace_mount": {
+        "path": "/tmp/xff-scheduler-host-workspace-mount.json",
+        "sha256": "4937daab90907774e964c43b540d05af7f6fe775ade3b79e9fd8497c642094a4"
+      },
+      "tmp_mount": {
+        "path": "/tmp/xff-scheduler-host-tmp-mount.json",
+        "sha256": "871dd82b3aa5bc0e0d821992a9044f48790d00e0846d146cd9a99b6d866581bd"
+      },
+      "shm_mount": {
+        "path": "/tmp/xff-scheduler-host-shm-mount.json",
+        "sha256": "6dc12c4272076d009c12a7ecb7a8370fd0ca77bf39fbbfc1aedb543072a85dbd"
+      },
+      "block_devices": {
+        "path": "/tmp/xff-scheduler-host-block-devices.json",
+        "sha256": "d3146ad6efdce85ed1bb7c80a6aab387f46cf8c92bf6ec16093b15855358109b"
+      }
+    }
+  },
+  "observations": {
+    "observed_at": {
+      "sha256": "ca377dbfc10823cc81358a42378f08ea63fe3d2b5509bee6fc9970e52272eff0",
+      "stdout": "2026-10-10T09:36:42+00:00\n"
+    },
+    "lscpu": {
+      "sha256": "56f9949339746e00e0b655e96d0acaf2748052517a35f670f3556c5da6a4df97",
+      "stdout": "{\n   \"lscpu\": [\n      {\n         \"field\": \"Architecture:\",\n         \"data\": \"x86_64\"\n      },{\n         \"field\": \"CPU op-mode(s):\",\n         \"data\": \"32-bit, 64-bit\"\n      },{\n         \"field\": \"Address sizes:\",\n         \"data\": \"48 bits physical, 48 bits virtual\"\n      },{\n         \"field\": \"Byte Order:\",\n         \"data\": \"Little Endian\"\n      },{\n         \"field\": \"CPU(s):\",\n         \"data\": \"10\"\n      },{\n         \"field\": \"On-line CPU(s) list:\",\n         \"data\": \"0-9\"\n      },{\n         \"field\": \"Vendor ID:\",\n         \"data\": \"AuthenticAMD\"\n      },{\n         \"field\": \"Model name:\",\n         \"data\": \"AMD Ryzen 9 9950X 16-Core Processor\"\n      },{\n         \"field\": \"CPU family:\",\n         \"data\": \"26\"\n      },{\n         \"field\": \"Model:\",\n         \"data\": \"68\"\n      },{\n         \"field\": \"Thread(s) per core:\",\n         \"data\": \"1\"\n      },{\n         \"field\": \"Core(s) per socket:\",\n         \"data\": \"10\"\n      },{\n         \"field\": \"Socket(s):\",\n         \"data\": \"1\"\n      },{\n         \"field\": \"Stepping:\",\n         \"data\": \"0\"\n      },{\n         \"field\": \"BogoMIPS:\",\n         \"data\": \"8583.90\"\n      },{\n         \"field\": \"Flags:\",\n         \"data\": \"fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm rep_good nopl xtopology cpuid extd_apicid tsc_known_freq pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy svm cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw perfctr_core ssbd perfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid avx512f avx512dq adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves user_shstk avx_vnni avx512_bf16 clzero xsaveerptr wbnoinvd arat npt lbrv nrip_save tsc_scale vmcb_clean flushbyasid pausefilter pfthreshold v_vmsave_vmload vgif vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid movdiri movdir64b overflow_recov succor fsrm avx512_vp2intersect flush_l1d\"\n      },{\n         \"field\": \"Virtualization:\",\n         \"data\": \"AMD-V\"\n      },{\n         \"field\": \"Hypervisor vendor:\",\n         \"data\": \"KVM\"\n      },{\n         \"field\": \"Virtualization type:\",\n         \"data\": \"full\"\n      },{\n         \"field\": \"L1d cache:\",\n         \"data\": \"640 KiB (10 instances)\"\n      },{\n         \"field\": \"L1i cache:\",\n         \"data\": \"640 KiB (10 instances)\"\n      },{\n         \"field\": \"L2 cache:\",\n         \"data\": \"5 MiB (10 instances)\"\n      },{\n         \"field\": \"L3 cache:\",\n         \"data\": \"160 MiB (10 instances)\"\n      },{\n         \"field\": \"NUMA node(s):\",\n         \"data\": \"1\"\n      },{\n         \"field\": \"NUMA node0 CPU(s):\",\n         \"data\": \"0-9\"\n      },{\n         \"field\": \"Vulnerability Gather data sampling:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Ghostwrite:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Indirect target selection:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Itlb multihit:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability L1tf:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Mds:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Meltdown:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Mmio stale data:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Old microcode:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Reg file data sampling:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Retbleed:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Spec rstack overflow:\",\n         \"data\": \"Mitigation; IBPB on VMEXIT only\"\n      },{\n         \"field\": \"Vulnerability Spec store bypass:\",\n         \"data\": \"Mitigation; Speculative Store Bypass disabled via prctl\"\n      },{\n         \"field\": \"Vulnerability Spectre v1:\",\n         \"data\": \"Mitigation; usercopy/swapgs barriers and __user pointer sanitization\"\n      },{\n         \"field\": \"Vulnerability Spectre v2:\",\n         \"data\": \"Mitigation; Enhanced / Automatic IBRS; IBPB conditional; STIBP disabled; PBRSB-eIBRS Not affected; BHI Not affected\"\n      },{\n         \"field\": \"Vulnerability Srbds:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Tsa:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Tsx async abort:\",\n         \"data\": \"Not affected\"\n      },{\n         \"field\": \"Vulnerability Vmscape:\",\n         \"data\": \"Not affected\"\n      }\n   ]\n}\n"
+    },
+    "core_topology": {
+      "sha256": "70da0bc6cc8ce561b46af772450e3bba4a653851116c86926e4b703b681d27ad",
+      "stdout": "{\n   \"cpus\": [\n      {\n         \"cpu\": 0,\n         \"socket\": 0,\n         \"core\": 0,\n         \"online\": true\n      },{\n         \"cpu\": 1,\n         \"socket\": 0,\n         \"core\": 1,\n         \"online\": true\n      },{\n         \"cpu\": 2,\n         \"socket\": 0,\n         \"core\": 2,\n         \"online\": true\n      },{\n         \"cpu\": 3,\n         \"socket\": 0,\n         \"core\": 3,\n         \"online\": true\n      },{\n         \"cpu\": 4,\n         \"socket\": 0,\n         \"core\": 4,\n         \"online\": true\n      },{\n         \"cpu\": 5,\n         \"socket\": 0,\n         \"core\": 5,\n         \"online\": true\n      },{\n         \"cpu\": 6,\n         \"socket\": 0,\n         \"core\": 6,\n         \"online\": true\n      },{\n         \"cpu\": 7,\n         \"socket\": 0,\n         \"core\": 7,\n         \"online\": true\n      },{\n         \"cpu\": 8,\n         \"socket\": 0,\n         \"core\": 8,\n         \"online\": true\n      },{\n         \"cpu\": 9,\n         \"socket\": 0,\n         \"core\": 9,\n         \"online\": true\n      }\n   ]\n}\n"
+    },
+    "virtualization": {
+      "sha256": "3b691b22d6a04e2c63061f30b8d26048dc13d891ab7a9633a212a327b25c72fc",
+      "stdout": "kvm\n"
+    },
+    "workspace_mount": {
+      "sha256": "4937daab90907774e964c43b540d05af7f6fe775ade3b79e9fd8497c642094a4",
+      "stdout": "{\n   \"filesystems\": [\n      {\n         \"target\": \"/\",\n         \"source\": \"/dev/sda2\",\n         \"fstype\": \"ext4\",\n         \"options\": \"rw,relatime\"\n      }\n   ]\n}\n"
+    },
+    "tmp_mount": {
+      "sha256": "871dd82b3aa5bc0e0d821992a9044f48790d00e0846d146cd9a99b6d866581bd",
+      "stdout": "{\n   \"filesystems\": [\n      {\n         \"target\": \"/tmp\",\n         \"source\": \"tmpfs\",\n         \"fstype\": \"tmpfs\",\n         \"options\": \"rw,nosuid,nodev,size=31622124k,nr_inodes=1048576,inode64,usrquota\"\n      }\n   ]\n}\n"
+    },
+    "shm_mount": {
+      "sha256": "6dc12c4272076d009c12a7ecb7a8370fd0ca77bf39fbbfc1aedb543072a85dbd",
+      "stdout": "{\n   \"filesystems\": [\n      {\n         \"target\": \"/dev/shm\",\n         \"source\": \"tmpfs\",\n         \"fstype\": \"tmpfs\",\n         \"options\": \"rw,nosuid,nodev,inode64,usrquota\"\n      }\n   ]\n}\n"
+    },
+    "block_devices": {
+      "sha256": "d3146ad6efdce85ed1bb7c80a6aab387f46cf8c92bf6ec16093b15855358109b",
+      "stdout": "{\n   \"blockdevices\": [\n      {\n         \"name\": \"loop0\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop1\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop2\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop3\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop4\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop5\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop6\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop8\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop9\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop10\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop11\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop12\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop13\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop14\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop15\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop16\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop17\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop18\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop20\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop21\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop22\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop23\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop24\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop25\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop26\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"loop27\",\n         \"type\": \"loop\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": null\n      },{\n         \"name\": \"sda\",\n         \"type\": \"disk\",\n         \"rota\": true,\n         \"tran\": null,\n         \"model\": \"QEMU HARDDISK\"\n      },{\n         \"name\": \"sr0\",\n         \"type\": \"rom\",\n         \"rota\": true,\n         \"tran\": \"ata\",\n         \"model\": \"QEMU DVD-ROM\"\n      }\n   ]\n}\n"
+    }
+  }
+}
diff --git a/docs/benchmarks/native-resource-accounting-controls.json b/docs/benchmarks/native-resource-accounting-controls.json
new file mode 100644
index 00000000000..a7f5a52f409
--- /dev/null
+++ b/docs/benchmarks/native-resource-accounting-controls.json
@@ -0,0 +1,346 @@
+{
+  "status": "RSS diagnostic controls; wall times are not performance acceptance evidence",
+  "resource_launcher": {
+    "path": "/home/marcus/.cache/bazel/_bazel_marcus/903d84883bded70e9e5965dd7aeb82fa/execroot/_main/bazel-out/k8-opt/bin/tools/process_resources_native",
+    "sha256": "e6766cea6431e91b5a5c1d16746079d59ed0e70bb13bce220e9796d23a09fb89",
+    "memory_method": "native pipeline fork/wait4 v1; native pre-exec footprint included; launcher usage excluded",
+    "wall_method": "monotonic wall time includes native launcher startup, output draining and teardown"
+  },
+  "tools": {
+    "xff": {
+      "status": "available",
+      "path": "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+      "version": "xff 0.0.0",
+      "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106"
+    },
+    "find": {
+      "status": "available",
+      "path": "/usr/bin/find",
+      "version": "find (GNU findutils) 4.10.0\nCopyright (C) 2024 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n\nWritten by Eric B. Decker, James Youngman, and Kevin Dalley.\nFeatures enabled: D_TYPE O_NOFOLLOW(enabled) LEAF_OPTIMISATION FTS(FTS_CWDFD) CBO(level=1)",
+      "sha256": "efe4843f166525b02f328f0c456a884d6a597f32d2c78cd615b6be0b64279bcf"
+    },
+    "rg": {
+      "status": "available",
+      "path": "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+      "version": "ripgrep 15.2.0 (rev e89fff89ac)\n\nfeatures:+pcre2\nsimd(compile):+SSE2,-SSSE3,-AVX2\nsimd(runtime):+SSE2,+SSSE3,+AVX2\n\nPCRE2 10.45 is available (JIT is available)",
+      "sha256": "e62198eb19b136b88c330af83647b5a962cb99b6b1f066758568f12de1974849"
+    },
+    "true": {
+      "status": "available",
+      "path": "/usr/bin/gnutrue",
+      "version": "true (GNU coreutils) 9.7\nPackaged by Ubuntu (9.7-3ubuntu2.1)\nCopyright (C) 2025 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n\nWritten by Jim Meyering.",
+      "sha256": "913a39cd38f353497086bcf317b12f91f93c23b51869cea763b8340b4f84cfd3"
+    }
+  },
+  "fixture_files": 20,
+  "expected_paths": [
+    "./.gitignore",
+    "./.hidden_00000.log",
+    "./.hidden_00011.txt",
+    "./item_00001.txt",
+    "./item_00002.log",
+    "./item_00003.txt",
+    "./item_00004.log",
+    "./item_00005.txt",
+    "./item_00006.log",
+    "./item_00007.txt",
+    "./item_00008.log",
+    "./item_00009.txt",
+    "./item_00010.log",
+    "./item_00012.log",
+    "./item_00013.txt",
+    "./item_00014.log",
+    "./item_00015.txt",
+    "./item_00016.log",
+    "./item_00017.txt",
+    "./item_00018.log"
+  ],
+  "expected_sha256": "a08e011d2c445f401a7e3849d42c2d38d703efb9b3286892a44f26cb67ec49d8",
+  "samples": [
+    {
+      "tool": "xff",
+      "repetition": 1,
+      "command": [
+        "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+        "--no-config",
+        "--no-pager",
+        "--color=never",
+        "--jobs=1",
+        "--sort=none",
+        "--exact",
+        "--case=sensitive",
+        "--gitignore=off",
+        "--hidden",
+        ".",
+        "-type",
+        "f",
+        "-print0"
+      ],
+      "native_peak_bytes": 5582848,
+      "python_peak_bytes": 25018368,
+      "time_peak_bytes": 5361664
+    },
+    {
+      "tool": "xff",
+      "repetition": 2,
+      "command": [
+        "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+        "--no-config",
+        "--no-pager",
+        "--color=never",
+        "--jobs=1",
+        "--sort=none",
+        "--exact",
+        "--case=sensitive",
+        "--gitignore=off",
+        "--hidden",
+        ".",
+        "-type",
+        "f",
+        "-print0"
+      ],
+      "native_peak_bytes": 5562368,
+      "python_peak_bytes": 25141248,
+      "time_peak_bytes": 5578752
+    },
+    {
+      "tool": "xff",
+      "repetition": 3,
+      "command": [
+        "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+        "--no-config",
+        "--no-pager",
+        "--color=never",
+        "--jobs=1",
+        "--sort=none",
+        "--exact",
+        "--case=sensitive",
+        "--gitignore=off",
+        "--hidden",
+        ".",
+        "-type",
+        "f",
+        "-print0"
+      ],
+      "native_peak_bytes": 5468160,
+      "python_peak_bytes": 25227264,
+      "time_peak_bytes": 5324800
+    },
+    {
+      "tool": "xff",
+      "repetition": 4,
+      "command": [
+        "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+        "--no-config",
+        "--no-pager",
+        "--color=never",
+        "--jobs=1",
+        "--sort=none",
+        "--exact",
+        "--case=sensitive",
+        "--gitignore=off",
+        "--hidden",
+        ".",
+        "-type",
+        "f",
+        "-print0"
+      ],
+      "native_peak_bytes": 5410816,
+      "python_peak_bytes": 25268224,
+      "time_peak_bytes": 5554176
+    },
+    {
+      "tool": "xff",
+      "repetition": 5,
+      "command": [
+        "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+        "--no-config",
+        "--no-pager",
+        "--color=never",
+        "--jobs=1",
+        "--sort=none",
+        "--exact",
+        "--case=sensitive",
+        "--gitignore=off",
+        "--hidden",
+        ".",
+        "-type",
+        "f",
+        "-print0"
+      ],
+      "native_peak_bytes": 5369856,
+      "python_peak_bytes": 25202688,
+      "time_peak_bytes": 5382144
+    },
+    {
+      "tool": "find",
+      "repetition": 1,
+      "command": ["/usr/bin/find", "-P", ".", "-type", "f", "-print0"],
+      "native_peak_bytes": 3276800,
+      "python_peak_bytes": 24952832,
+      "time_peak_bytes": 3227648
+    },
+    {
+      "tool": "find",
+      "repetition": 2,
+      "command": ["/usr/bin/find", "-P", ".", "-type", "f", "-print0"],
+      "native_peak_bytes": 3219456,
+      "python_peak_bytes": 25128960,
+      "time_peak_bytes": 3162112
+    },
+    {
+      "tool": "find",
+      "repetition": 3,
+      "command": ["/usr/bin/find", "-P", ".", "-type", "f", "-print0"],
+      "native_peak_bytes": 3309568,
+      "python_peak_bytes": 25051136,
+      "time_peak_bytes": 3325952
+    },
+    {
+      "tool": "find",
+      "repetition": 4,
+      "command": ["/usr/bin/find", "-P", ".", "-type", "f", "-print0"],
+      "native_peak_bytes": 3309568,
+      "python_peak_bytes": 25067520,
+      "time_peak_bytes": 3338240
+    },
+    {
+      "tool": "find",
+      "repetition": 5,
+      "command": ["/usr/bin/find", "-P", ".", "-type", "f", "-print0"],
+      "native_peak_bytes": 3338240,
+      "python_peak_bytes": 25010176,
+      "time_peak_bytes": 3325952
+    },
+    {
+      "tool": "rg",
+      "repetition": 1,
+      "command": [
+        "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+        "--no-config",
+        "--hidden",
+        "--no-ignore",
+        "--threads=1",
+        "--color=never",
+        "--files",
+        "-0",
+        "."
+      ],
+      "native_peak_bytes": 3612672,
+      "python_peak_bytes": 24997888,
+      "time_peak_bytes": 3612672
+    },
+    {
+      "tool": "rg",
+      "repetition": 2,
+      "command": [
+        "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+        "--no-config",
+        "--hidden",
+        "--no-ignore",
+        "--threads=1",
+        "--color=never",
+        "--files",
+        "-0",
+        "."
+      ],
+      "native_peak_bytes": 3612672,
+      "python_peak_bytes": 25018368,
+      "time_peak_bytes": 3612672
+    },
+    {
+      "tool": "rg",
+      "repetition": 3,
+      "command": [
+        "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+        "--no-config",
+        "--hidden",
+        "--no-ignore",
+        "--threads=1",
+        "--color=never",
+        "--files",
+        "-0",
+        "."
+      ],
+      "native_peak_bytes": 3612672,
+      "python_peak_bytes": 25067520,
+      "time_peak_bytes": 3612672
+    },
+    {
+      "tool": "rg",
+      "repetition": 4,
+      "command": [
+        "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+        "--no-config",
+        "--hidden",
+        "--no-ignore",
+        "--threads=1",
+        "--color=never",
+        "--files",
+        "-0",
+        "."
+      ],
+      "native_peak_bytes": 3612672,
+      "python_peak_bytes": 25141248,
+      "time_peak_bytes": 3612672
+    },
+    {
+      "tool": "rg",
+      "repetition": 5,
+      "command": [
+        "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+        "--no-config",
+        "--hidden",
+        "--no-ignore",
+        "--threads=1",
+        "--color=never",
+        "--files",
+        "-0",
+        "."
+      ],
+      "native_peak_bytes": 3612672,
+      "python_peak_bytes": 25174016,
+      "time_peak_bytes": 3612672
+    },
+    {
+      "tool": "true",
+      "repetition": 1,
+      "command": ["/usr/bin/true"],
+      "native_peak_bytes": 1581056,
+      "python_peak_bytes": 25128960,
+      "time_peak_bytes": 1581056
+    },
+    {
+      "tool": "true",
+      "repetition": 2,
+      "command": ["/usr/bin/true"],
+      "native_peak_bytes": 1581056,
+      "python_peak_bytes": 25206784,
+      "time_peak_bytes": 1581056
+    },
+    {
+      "tool": "true",
+      "repetition": 3,
+      "command": ["/usr/bin/true"],
+      "native_peak_bytes": 1581056,
+      "python_peak_bytes": 25067520,
+      "time_peak_bytes": 1581056
+    },
+    {
+      "tool": "true",
+      "repetition": 4,
+      "command": ["/usr/bin/true"],
+      "native_peak_bytes": 1581056,
+      "python_peak_bytes": 24944640,
+      "time_peak_bytes": 1581056
+    },
+    {
+      "tool": "true",
+      "repetition": 5,
+      "command": ["/usr/bin/true"],
+      "native_peak_bytes": 1581056,
+      "python_peak_bytes": 25022464,
+      "time_peak_bytes": 1581056
+    }
+  ]
+}
diff --git a/docs/benchmarks/native-resource-accounting-portability-controls.json b/docs/benchmarks/native-resource-accounting-portability-controls.json
new file mode 100644
index 00000000000..073e7b1d986
--- /dev/null
+++ b/docs/benchmarks/native-resource-accounting-portability-controls.json
@@ -0,0 +1,346 @@
+{
+  "status": "RSS diagnostic controls; wall times are not performance acceptance evidence",
+  "resource_launcher": {
+    "path": "/home/marcus/.cache/bazel/_bazel_marcus/903d84883bded70e9e5965dd7aeb82fa/execroot/_main/bazel-out/k8-opt/bin/tools/process_resources_native",
+    "sha256": "60bcb395bb3d0eccccd0a3d0cb2407538b1f96c45d5e1e156a0bd4522f93328e",
+    "memory_method": "native pipeline fork/wait4 v1; native pre-exec footprint included; launcher usage excluded",
+    "wall_method": "monotonic wall time includes native launcher startup, output draining and teardown"
+  },
+  "tools": {
+    "xff": {
+      "status": "available",
+      "path": "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+      "version": "xff 0.0.0",
+      "sha256": "f97833a8eb45f49b596665b47911c2df9a2558619778512fd31d1b38f2e56106"
+    },
+    "find": {
+      "status": "available",
+      "path": "/usr/bin/find",
+      "version": "find (GNU findutils) 4.10.0\nCopyright (C) 2024 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n\nWritten by Eric B. Decker, James Youngman, and Kevin Dalley.\nFeatures enabled: D_TYPE O_NOFOLLOW(enabled) LEAF_OPTIMISATION FTS(FTS_CWDFD) CBO(level=1)",
+      "sha256": "efe4843f166525b02f328f0c456a884d6a597f32d2c78cd615b6be0b64279bcf"
+    },
+    "rg": {
+      "status": "available",
+      "path": "/home/marcus/.codex/packages/standalone/releases/0.162.0-x86_64-unknown-linux-musl/codex-path/rg",
+      "version": "ripgrep 15.2.0 (rev e89fff89ac)\n\nfeatures:+pcre2\nsimd(compile):+SSE2,-SSSE3,-AVX2\nsimd(runtime):+SSE2,+SSSE3,+AVX2\n\nPCRE2 10.45 is available (JIT is available)",
+      "sha256": "e62198eb19b136b88c330af83647b5a962cb99b6b1f066758568f12de1974849"
+    },
+    "true": {
+      "status": "available",
+      "path": "/usr/bin/gnutrue",
+      "version": "true (GNU coreutils) 9.7\nPackaged by Ubuntu (9.7-3ubuntu2.1)\nCopyright (C) 2025 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n\nWritten by Jim Meyering.",
+      "sha256": "913a39cd38f353497086bcf317b12f91f93c23b51869cea763b8340b4f84cfd3"
+    }
+  },
+  "fixture_files": 20,
+  "expected_paths": [
+    "./.gitignore",
+    "./.hidden_00000.log",
+    "./.hidden_00011.txt",
+    "./item_00001.txt",
+    "./item_00002.log",
+    "./item_00003.txt",
+    "./item_00004.log",
+    "./item_00005.txt",
+    "./item_00006.log",
+    "./item_00007.txt",
+    "./item_00008.log",
+    "./item_00009.txt",
+    "./item_00010.log",
+    "./item_00012.log",
+    "./item_00013.txt",
+    "./item_00014.log",
+    "./item_00015.txt",
+    "./item_00016.log",
+    "./item_00017.txt",
+    "./item_00018.log"
+  ],
+  "expected_sha256": "a08e011d2c445f401a7e3849d42c2d38d703efb9b3286892a44f26cb67ec49d8",
+  "samples": [
+    {
+      "tool": "xff",
+      "repetition": 1,
+      "command": [
+        "/tmp/xff-perf-shared-executor-clean-v2/binaries/4ea895f63106f05df7c90b629d20433ae1e03016/xff",
+        "--no-config",
+        "--no-pager",
+        "--color=never",
+        "--jobs=1",
+        "--sort=none",
+        "--exact",
+        "--case=sensitive",
+        "--gitignore=off",
+        "--hidden",
+        ".",
+        "-type",
+        "f",
+        "-print0"
+      ],
+      "native_peak_bytes": 5292032,
+      "python_peak_bytes": 25214976,
+      "time_peak_bytes": 5386240
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diff --git a/docs/benchmarks/native-workload-allocation-controls.json b/docs/benchmarks/native-workload-allocation-controls.json
new file mode 100644
index 00000000000..93f25a2f037
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+++ b/docs/benchmarks/native-workload-allocation-controls.json
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+{
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+          "raw_sha256": "a44dd80f24fe185924b2862cc36e1f021e9458660f76467e4098b3022e2e7988"
+        }
+      ]
+    },
+    "deep-100000-jobs1-files-stat-lazy": {
+      "bytes": 40575761,
+      "sha256": "3438b26a5c1c944cff66f5507c8bd1a750314e99d795ef3af5e1f119488933b4",
+      "parts": [
+        {
+          "name": "native-workload-allocation-deep-100000-jobs1-files-stat-lazy-bytes-1.gz",
+          "offset": 0,
+          "bytes": 304563,
+          "sha256": "11e5ffc87560754f6c261d796a012497f7a4d04e36abe527effa65301fcdb495",
+          "raw_bytes": 20287880,
+          "raw_sha256": "0f4d533b6457799d71c2f06b36cbcffb4c1252779a6793045bb7ac4054885518"
+        },
+        {
+          "name": "native-workload-allocation-deep-100000-jobs1-files-stat-lazy-bytes-2.gz",
+          "offset": 20287880,
+          "bytes": 270363,
+          "sha256": "7966460eb48830de3fe5ad4d133f2f2514f85743362bbeda0cb1381a6780f0f6",
+          "raw_bytes": 20287881,
+          "raw_sha256": "62a2f97187f37d77653945216ae5a116ea6af494a0eae009ac104d1b17b5709c"
+        }
+      ]
+    },
+    "deep-100000-jobs1-files-stat-eager": {
+      "bytes": 40346449,
+      "sha256": "7d8b90ae3c9dbfe01d21511b38129ba768a57da329175feced43dd78c8a07449",
+      "parts": [
+        {
+          "name": "native-workload-allocation-deep-100000-jobs1-files-stat-eager-bytes-1.gz",
+          "offset": 0,
+          "bytes": 305672,
+          "sha256": "7eae07a2598ecde63a83ec61efe7012f8d2e513855cf7970a76e9b7a3c61b68e",
+          "raw_bytes": 20173224,
+          "raw_sha256": "2bd59b50da6ce5b2fa9941eb57e529c6be85ab05ca9ae272d90ad6b5b45301ae"
+        },
+        {
+          "name": "native-workload-allocation-deep-100000-jobs1-files-stat-eager-bytes-2.gz",
+          "offset": 20173224,
+          "bytes": 270685,
+          "sha256": "1005d6e2b58340aa9777cb44b1e7b45ed9b440611f60fdda6f11bb594398ebb4",
+          "raw_bytes": 20173225,
+          "raw_sha256": "309251cc9577aa70366aa7bfa0dd9a9c4435dd1b451e499ac0cd3e03d0d48a12"
+        }
+      ]
+    },
+    "deep-100000-jobs1-content-needle": {
+      "bytes": 15607947,
+      "sha256": "65175c90222905d2a565c41bd9e46017e1c6c27f18f8bc4f069e960a442e875e",
+      "parts": [
+        {
+          "name": "native-workload-allocation-deep-100000-jobs1-content-needle.json.gz",
+          "offset": 0,
+          "bytes": 302996,
+          "sha256": "743b5678eee576db6413cceefeee748c38032beaa0cbeac8bf33fa17c72a31c1",
+          "raw_bytes": 15607947,
+          "raw_sha256": "65175c90222905d2a565c41bd9e46017e1c6c27f18f8bc4f069e960a442e875e"
+        }
+      ]
+    },
+    "provenance": {
+      "bytes": 277926,
+      "sha256": "4a0de2cfce3f87041da6a4564eb633735034c988a8a1d6bc3b2a1a7a7a262f7f",
+      "parts": [
+        {
+          "name": "native-workload-allocation-provenance.json.gz",
+          "offset": 0,
+          "bytes": 58738,
+          "sha256": "b860d2b92e44fffe1599155dd389ae4968e24085cb0a8eecfe0a264853e8366d",
+          "raw_bytes": 277926,
+          "raw_sha256": "4a0de2cfce3f87041da6a4564eb633735034c988a8a1d6bc3b2a1a7a7a262f7f"
+        }
+      ]
+    }
+  },
+  "reassembly": "decompress parts and concatenate by ascending byte offset; decode reconstructed JSON; reuse references preserve exact original file bytes",
+  "exclusions": [
+    "Original executable/helper and profiler executable bytes remain at indexed local paths; their hashes/source/package provenance are retained.",
+    "Single observations on warm tmpfs do not establish slow-storage or multiworker admission policy.",
+    "No precise phase CPU attribution, repeated A/B or native M5 Pro acceptance is claimed."
+  ]
+}
diff --git a/docs/benchmarks/native-workload-allocation-deep-100000-jobs1-content-needle.json.gz b/docs/benchmarks/native-workload-allocation-deep-100000-jobs1-content-needle.json.gz
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diff --git a/docs/benchmarks/native-workload-allocation-provenance.json.gz b/docs/benchmarks/native-workload-allocation-provenance.json.gz
new file mode 100644
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diff --git a/tools/BUILD.bazel b/tools/BUILD.bazel
index d1d94b1b699..3dfdc58290b 100644
--- a/tools/BUILD.bazel
+++ b/tools/BUILD.bazel
@@ -390,6 +390,37 @@ py_library(
         ".",
         "..",
     ],
+    deps = [":process_resources_lib"],
+)
+
+# A small process/pipe adapter. It never opens writable host handles or launches a shell.
+cc_binary(
+    name = "process_resources_native",
+    srcs = ["process_resources_native.cc"],
+    deps = [
+        "@abseil-cpp//absl/status",
+        "@abseil-cpp//absl/status:statusor",
+        "@abseil-cpp//absl/strings",
+        "@mboworks_mbo//mbo/status:status_macros_cc",
+    ],
+)
+
+py_library(
+    name = "process_resources_lib",
+    srcs = ["process_resources.py"],
+    data = [
+        "process_resources_native.cc",
+        ":process_resources_native",
+    ],
+    imports = ["."],
+    deps = ["@rules_python//python/runfiles"],
+)
+
+py_test(
+    name = "process_resources_test",
+    size = "small",
+    srcs = ["process_resources_test.py"],
+    deps = [":process_resources_lib"],
 )
 
 py_library(
@@ -687,6 +718,7 @@ py_test(
 py_binary(
     name = "measure_resources",
     srcs = ["measure_resources.py"],
+    deps = [":process_resources_lib"],
 )
 
 py_library(
@@ -813,6 +845,7 @@ test_suite(
         ":fuzz_targets_test",
         ":generate_mime_db_test",
         ":measure_resources_test",
+        ":process_resources_test",
         ":release_notes_test",
         ":release_site_test",
         ":site_artwork_test",
@@ -969,6 +1002,7 @@ py_library(
         ":benchmark_provenance_lib",
         ":benchmark_records_lib",
         ":benchmark_shards_lib",
+        ":process_resources_lib",
     ],
 )
 
@@ -983,6 +1017,7 @@ py_binary(
         ":benchmark_provenance_lib",
         ":benchmark_records_lib",
         ":benchmark_shards_lib",
+        ":process_resources_lib",
     ],
 )
 
@@ -1003,6 +1038,7 @@ py_library(
         ":benchmark_matrix_lib",
         ":benchmark_overview_lib",
         ":benchmark_shards_lib",
+        ":process_resources_lib",
     ],
 )
 
@@ -1015,6 +1051,7 @@ py_binary(
         ":benchmark_matrix_lib",
         ":benchmark_overview_lib",
         ":benchmark_shards_lib",
+        ":process_resources_lib",
     ],
 )
 
@@ -1127,6 +1164,7 @@ py_library(
     deps = [
         ":benchmark_matrix_lib",
         ":benchmark_records_lib",
+        ":process_resources_lib",
     ],
 )
 
@@ -1137,6 +1175,7 @@ py_binary(
         ":benchmark_compare_lib",
         ":benchmark_matrix_lib",
         ":benchmark_records_lib",
+        ":process_resources_lib",
     ],
 )
 
diff --git a/tools/benchmark.py b/tools/benchmark.py
index 08c8853ed36..f3be7d53648 100755
--- a/tools/benchmark.py
+++ b/tools/benchmark.py
@@ -486,6 +486,8 @@ def parser_for_cli():
         sub.add_argument('--disk-cache', type=Path, default=Path.home() / '.cache/bazel-disk', help='Bazel action cache')
         sub.add_argument('--build-library-path', type=Path,
                          help='runtime libraries for historical build tools; passed to Bazel build actions')
+        sub.add_argument('--resource-launcher', type=Path,
+                         help='explicit prebuilt native accounting binary for direct script use')
         sub.add_argument('--full', action='store_true', help='show every revision instead of compact history ranges')
         if command == 'backfill':
             sub.add_argument('-Y', '--yes', action='store_true', help='answer the execution confirmation with yes')
diff --git a/tools/benchmark_backfill.py b/tools/benchmark_backfill.py
index 00e2be015ea..a5e23aa4a77 100644
--- a/tools/benchmark_backfill.py
+++ b/tools/benchmark_backfill.py
@@ -26,6 +26,7 @@
 import benchmark_matrix
 import benchmark_provenance
 import benchmark_shards
+import process_resources
 
 
 def now():
@@ -125,7 +126,7 @@ def revisions(repo, references, history_root=None, history_platform='macos'):
     return sorted(selected.values(), key=lambda entry: (datetime.fromisoformat(entry['date']), entry['sha']))
 
 
-def environment():
+def environment(resource_launcher=None):
     tools = {name: compare.tool_info(name, shutil.which(name)) for name in ('find', 'rg', 'fzf')}
     if any(tool['status'] != 'available' for tool in tools.values()):
         raise ValueError('backfill requires find, rg and fzf')
@@ -134,17 +135,22 @@ def environment():
         'platform': platform.platform(), 'machine': platform.machine(), 'cpu_count': os.cpu_count(),
         'allowed_cpus': sorted(os.sched_getaffinity(0)) if hasattr(os, 'sched_getaffinity') else None,
         'python': sys.version, 'tools': tools,
+        'resource_launcher': process_resources.launcher_identity(resource_launcher),
     }
 
 
 def driver_identity():
-    return {Path(module.__file__).name: compare.digest(module.__file__)
+    result = {Path(module.__file__).name: compare.digest(module.__file__)
             for module in (sys.modules[__name__], compare, benchmark_fixture, benchmark_layouts,
-                           benchmark_matrix, benchmark_shards, benchmark_provenance)}
+                           benchmark_matrix, benchmark_shards, benchmark_provenance, process_resources)}
+    source = Path(process_resources.__file__).with_name('process_resources_native.cc')
+    result[source.name] = compare.digest(source)
+    return result
 
 
 def check_environment(expected):
-    difference = benchmark_shards.identity_difference(expected, environment())
+    launcher = expected.get('resource_launcher', {}).get('path')
+    difference = benchmark_shards.identity_difference(expected, environment(launcher))
     if difference:
         raise ValueError('backfill environment changed: ' + difference)
 
@@ -185,7 +191,7 @@ def make_contract(args, *, campaign=None, collection=None):
         'schema': 1, 'series': args.series, 'revisions': selected,
         'platform': system, 'purpose': args.purpose, 'allocation': allocation,
         'replacement_target': f'github-ci-{system}' if args.purpose == 'ci-replacement' else None,
-        'environment': environment(), 'driver': driver_identity(),
+        'environment': environment(getattr(args, 'resource_launcher', None)), 'driver': driver_identity(),
         'files': counts, 'cpus': cpus, 'depth': args.depth,
         'repetitions': args.repetitions, 'retained': args.keep,
         'require_cpu_affinity': allocation['required'],
@@ -389,7 +395,8 @@ def run(args, batch):
                         keep=contract['retained'], cpu_counts=contract['cpus'], require_tools=True,
                         fixture_parent=contract['storage']['parent'], require_memory=contract['storage']['memory_required'],
                         require_cpu_affinity=contract['require_cpu_affinity'], progress=progress,
-                        layouts=contract.get('layouts') or None)
+                        layouts=contract.get('layouts') or None,
+                        resource_launcher=contract['environment'].get('resource_launcher', {}).get('path'))
                 check_environment(contract['environment'])
                 if report['tools']['xff']['sha256'] != build_record['sha256']:
                     raise ValueError('measured binary does not match build: ' + sha)
@@ -451,6 +458,8 @@ def main():
     parser.add_argument('--disk-cache', type=Path)
     parser.add_argument('--build-library-path', type=Path,
                         help='runtime libraries for historical build tools; passed to Bazel build actions')
+    parser.add_argument('--resource-launcher', type=Path,
+                        help='Explicit prebuilt native accounting binary for direct script use')
     parser.add_argument('--run', action='store_true', help='Build and measure; otherwise only write/validate the batch plan')
     args = parser.parse_args()
     args.layouts = ([] if args.purpose == 'ci-replacement' or args.layout_revision == 'legacy'
diff --git a/tools/benchmark_backfill_test.py b/tools/benchmark_backfill_test.py
index 82373854fff..3d2fb9211dc 100644
--- a/tools/benchmark_backfill_test.py
+++ b/tools/benchmark_backfill_test.py
@@ -20,6 +20,21 @@
 
 
 class BenchmarkBackfillTest(unittest.TestCase):
+    def test_resource_launcher_is_frozen_in_the_environment_and_hash_drift_stops_resume(self):
+        identity = {'path': '/native-launcher', 'sha256': 'a' * 64,
+                    'memory_method': 'native fork/wait4 v1', 'wall_method': 'native boundary included'}
+        with mock.patch.object(backfill.compare, 'tool_info', return_value={'status': 'available'}), \
+                mock.patch.object(backfill.process_resources, 'launcher_identity', return_value=identity) as launcher:
+            expected = backfill.environment(Path('/native-launcher'))
+        launcher.assert_called_once_with(Path('/native-launcher'))
+        self.assertEqual(expected['resource_launcher'], identity)
+        changed = copy.deepcopy(expected)
+        changed['resource_launcher']['sha256'] = 'b' * 64
+        with mock.patch.object(backfill, 'environment', return_value=changed) as environment:
+            with self.assertRaisesRegex(ValueError, r'resource_launcher.sha256'):
+                backfill.check_environment(expected)
+        environment.assert_called_once_with('/native-launcher')
+
     def test_progress_uses_local_time_at_emission_and_revision_position(self):
         output = io.StringIO()
         with mock.patch.object(backfill, 'datetime') as clock, contextlib.redirect_stderr(output):
diff --git a/tools/benchmark_campaign.py b/tools/benchmark_campaign.py
index 4e0d0616ed5..ef11a5f2cf5 100644
--- a/tools/benchmark_campaign.py
+++ b/tools/benchmark_campaign.py
@@ -73,7 +73,7 @@ def validate_plan(plan):
     require({job['platform'] for job in plan['jobs']} == set(PLATFORMS), 'both CI platforms are required')
 
 
-def run_job(plan, job_id, repo, output, disk_cache, fixture_parent):
+def run_job(plan, job_id, repo, output, disk_cache, fixture_parent, resource_launcher=None):
     validate_plan(plan)
     require(backfill.git(repo, 'rev-parse', 'HEAD') == plan['source_head'], 'campaign driver checkout changed')
     require(backfill.driver_identity() == plan['contract']['driver'], 'campaign driver files changed')
@@ -88,7 +88,7 @@ def run_job(plan, job_id, repo, output, disk_cache, fixture_parent):
         files=contract['files'], cpus=contract['cpus'], depth=contract['depth'],
         repetitions=contract['repetitions'], keep=contract['retained'],
         require_cpu_affinity=job['platform'] == 'linux', require_memory=job['platform'] == 'linux',
-        fixture_parent=fixture_parent, disk_cache=disk_cache)
+        fixture_parent=fixture_parent, disk_cache=disk_cache, resource_launcher=resource_launcher)
     collection = {'id': int(os.environ['GITHUB_RUN_ID']), 'run_attempt': int(os.environ['GITHUB_RUN_ATTEMPT']),
                   'head_sha': os.environ['GITHUB_SHA']}
     require(collection['head_sha'] == plan['source_head'], 'campaign source workflow changed')
@@ -135,6 +135,8 @@ def validate_measurements(record, batch, revision, tasks):
                        'build_identity': json.dumps(record['build']['configuration'], sort_keys=True)}.items():
         require(actual[key] == value, 'measurement contract mismatch: ' + key)
     environment, allocation = contract['environment'], contract['allocation']
+    require(report.get('resource_launcher') == environment.get('resource_launcher'),
+            'native resource launcher missing or changed')
     require(environment['cpu_count'] >= max(expected['cpus']),
             'insufficient or different measurement host')
     require(actual['platform'] == environment['platform'] and actual['cpu_count'] == environment['cpu_count'],
@@ -239,6 +241,8 @@ def main():
         run.add_argument('--' + name, type=Path, required=True)
     run.add_argument('--job', required=True)
     run.add_argument('--disk-cache', type=Path)
+    run.add_argument('--resource-launcher', type=Path,
+                     help='Explicit prebuilt native accounting binary for direct script use')
     publish = modes.add_parser('publish')
     for name in ('root', 'artifacts', 'source'):
         publish.add_argument('--' + name, type=Path, required=True)
@@ -251,7 +255,7 @@ def main():
                                      for job in result['jobs']]}))
     elif args.mode == 'run':
         return run_job(json.loads(args.plan.read_text()), args.job, args.repo.resolve(), args.output.resolve(),
-                       args.disk_cache, args.fixture_parent)
+                       args.disk_cache, args.fixture_parent, args.resource_launcher)
     else:
         print(retain(args.root, args.artifacts, json.loads(args.source.read_text()), args.repository))
     return 0
diff --git a/tools/benchmark_campaign_test.py b/tools/benchmark_campaign_test.py
index 3a26e99fe49..34446ce286c 100644
--- a/tools/benchmark_campaign_test.py
+++ b/tools/benchmark_campaign_test.py
@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 """Complete-revision campaigns, atomic promotion and preserved historical provenance."""
 
+import copy
 import json
 from pathlib import Path
 import tempfile
@@ -95,6 +96,35 @@ def write_artifacts(root, selected=None):
 
 
 class BenchmarkCampaignTest(unittest.TestCase):
+    def test_native_measurements_freeze_launcher_identity_and_validate_individual_process_peaks(self):
+        selected = plan()
+        job = selected['jobs'][0]
+        batch, record = job_data(selected, job)
+        resources = campaign.backfill.process_resources
+        identity = dict(path='/launcher', sha256='a' * 64,
+                        memory_method=resources.MEMORY_METHOD, wall_method=resources.WALL_METHOD)
+        batch['contract']['environment']['resource_launcher'] = identity
+        batch['identity'] = campaign.identity(batch['contract'])
+        record['batch'] = batch['identity']
+        report = record['tool_comparisons']
+        report['contract']['batch'] = batch['identity']
+        report['resource_launcher'] = dict(identity)
+        report['contract']['resource_accounting'] = {key: value for key, value in identity.items() if key != 'path'}
+        for task in report['tasks']:
+            for entry in task['participants'].values():
+                for sample in entry['samples']:
+                    sample.update(child_peak_rss_bytes=[100], peak_child_rss_bytes=100, sum_child_peak_rss_bytes=100)
+        campaign.validate_report(record, batch, job, selected)
+        for change in (lambda value: value.pop('resource_launcher'),
+                       lambda value: value['resource_launcher'].update(sha256='b' * 64),
+                       lambda value: value['contract']['resource_accounting'].update(wall_method='old boundary'),
+                       lambda value: value['tasks'][0]['participants']['xff']['samples'][0].update(
+                           sum_child_peak_rss_bytes=200)):
+            changed = copy.deepcopy(record)
+            change(changed['tool_comparisons'])
+            with self.subTest(change=change), self.assertRaisesRegex(ValueError, 'resource launcher|resource accounting|native process peaks'):
+                campaign.validate_report(changed, batch, job, selected)
+
     def test_planner_freezes_each_complete_revision_once_per_platform(self):
         revisions = [plan()['jobs'][0]['revision'], dict(plan()['jobs'][0]['revision'], sha='e' * 40)]
         with mock.patch.object(campaign.backfill, 'revisions', return_value=revisions), \
diff --git a/tools/benchmark_compare.py b/tools/benchmark_compare.py
index 507b0fde6bf..fad272d5da4 100644
--- a/tools/benchmark_compare.py
+++ b/tools/benchmark_compare.py
@@ -26,6 +26,7 @@
 import benchmark_matrix
 import benchmark_overview
 import benchmark_shards
+import process_resources
 
 DEFAULT_FILE_COUNTS = (10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10000)
 
@@ -38,55 +39,17 @@ def digest(path):
 
 
 def measure(spec):
-    """Fresh worker; account for each direct pipeline process, without a shell."""
+    """Fresh worker; fork measured commands after leaving Python's address space."""
     if sys.platform not in {"darwin", "linux"}:
         raise ValueError("resource accounting supports macOS and Linux only")
     if spec.get("cpu_affinity") is not None:
         os.sched_setaffinity(0, spec["cpu_affinity"])
-    children = []
-    chunks = []
-    first = None
-    with tempfile.TemporaryFile() as errors, open(spec["stdin"], "rb") as source:
-        started = time.monotonic()
-        try:
-            for command in spec["pipeline"]:
-                child = subprocess.Popen(command, stdin=source if not children else children[-1].stdout,
-                                         stdout=subprocess.PIPE, stderr=errors, env=spec["environment"], cwd=spec.get("cwd"))
-                if children:
-                    children[-1].stdout.close()
-                children.append(child)
-            stream = children[-1].stdout
-            byte = stream.read(1)
-            if byte:
-                first = time.monotonic() - started
-                chunks.append(byte)
-            while chunk := stream.read(65536):
-                chunks.append(chunk)
-            usages, codes = [], []
-            for child in children:
-                _, status, usage = os.wait4(child.pid, 0)
-                child.returncode = os.waitstatus_to_exitcode(status)
-                codes.append(child.returncode)
-                usages.append(usage)
-            elapsed = time.monotonic() - started
-            stream.close()
-        finally:
-            for child in children:
-                if child.returncode is None:
-                    child.kill()
-                    child.wait()
-                if child.stdout and not child.stdout.closed:
-                    child.stdout.close()
-        errors.seek(0)
-        stderr = errors.read().decode("utf-8", errors="replace")
-    output = b"".join(chunks)
-    rss = [usage.ru_maxrss * (1 if sys.platform == "darwin" else 1024) for usage in usages]
-    return {"elapsed_seconds": elapsed, "first_stdout_seconds": first,
-            "user_cpu_seconds": sum(usage.ru_utime for usage in usages),
-            "system_cpu_seconds": sum(usage.ru_stime for usage in usages),
-            "peak_child_rss_bytes": rss[0] if len(rss) == 1 else None,
-            "sum_child_peak_rss_bytes": sum(rss), "stdout_bytes": len(output),
-            "exit_codes": codes, "stderr": stderr, "output": base64.b64encode(output).decode()}
+    with open(spec["stdin"], "rb") as source:
+        sample = process_resources.measure_pipeline(
+            spec["pipeline"], source=source, cwd=spec.get("cwd"), environment=spec["environment"],
+            launcher=spec.get("resource_launcher"))
+    sample["output"] = base64.b64encode(sample["output"]).decode()
+    return sample
 
 
 def invoke(spec, worker):
@@ -232,7 +195,7 @@ def cpu_allocation(cpus, require_cpu_affinity=False):
 
 def collect(binary, files=2000, depth=40, repetitions=9, worker=None, require_tools=False,
             fixture_parent=None, require_memory=False, cpus=1, require_cpu_affinity=False, keep=None, fixtures=None, progress=None,
-            shapes=("broad", "deep"), round_offset=0, prepared_fixtures=None):
+            shapes=("broad", "deep"), round_offset=0, prepared_fixtures=None, resource_launcher=None):
     progress = progress or MeasurementProgress()
     keep = min(7, repetitions) if keep is None else keep
     if not 1 <= keep <= repetitions:
@@ -243,14 +206,16 @@ def collect(binary, files=2000, depth=40, repetitions=9, worker=None, require_to
              for name in ("xff", "find", "rg", "fzf")}
     if require_tools and any(tool["status"] != "available" for tool in tools.values()):
         raise ValueError("comparison tools are required: " + json.dumps(tools))
+    accounting = process_resources.launcher_identity(resource_launcher)
     worker = worker or [sys.executable, str(Path(__file__).resolve())]
-    report = {"schema": 1, "tools": tools, "contract": {
+    report = {"schema": 1, "tools": tools, "resource_launcher": accounting, "contract": {
         "files": files, "file_counts": [files], "cpu_counts": [cpus], "depth": depth, "storage": storage, "repetitions": repetitions, "fixture_version": 2, "retained": keep, "estimator": "mean-fastest",
         "platform": platform.platform(), "machine": platform.machine(), "cpu_count": os.cpu_count(), "requested_cpus": cpus, "cpu_affinity": affinity,
         "order": "rotate starting participant by task and round", "warmup_rounds": 1,
         "cache": "just written, then reused; no flush; discarded correctness-checked warmup round",
         "output": "NUL paths, unordered multiset; drained pipe; validation after timing",
         "memory": "single-process peak RSS; pipeline sum of individual peaks is an upper bound, not simultaneous peak",
+        "resource_accounting": {key: value for key, value in accounting.items() if key != "path"},
         "scope": "batch discovery versus separate precomputed-list filtering; no interactive/ranking equivalence",
         "environment": "inherited platform environment; isolated HOME; LC_ALL=C; FZF defaults removed; rg config disabled",
         "children": "direct leaf commands only; no shell or unaccounted subprocess trees"}, "tasks": []}
@@ -318,7 +283,9 @@ def collect(binary, files=2000, depth=40, repetitions=9, worker=None, require_to
                         phase = 'warm-up' if repetition == 0 else f'sample: {repetition}/{repetitions}'
                         progress(f'Workers: {cpus} Files: {files:,} Run: {completed + 1}/{total}; '
                                  f'{shape}/{name}; {label}; {phase}')
-                        sample = invoke({"pipeline": entry["pipeline"], "stdin": entry["stdin"], "cwd": entry["cwd"], "environment": environment, "cpu_affinity": affinity}, worker)
+                        sample = invoke({"pipeline": entry["pipeline"], "stdin": entry["stdin"], "cwd": entry["cwd"],
+                                         "environment": environment, "cpu_affinity": affinity,
+                                         "resource_launcher": accounting["path"]}, worker)
                         validate_output(sample, expected, entry["pipeline"])
                         completed += 1
                         if repetition:
@@ -327,12 +294,14 @@ def collect(binary, files=2000, depth=40, repetitions=9, worker=None, require_to
     for tool in tools.values():
         if tool["status"] == "available" and digest(tool["path"]) != tool["sha256"]:
             raise ValueError("tool binary changed during measurement")
+    if process_resources.launcher_identity(accounting["path"]) != accounting:
+        raise ValueError("native resource launcher changed during measurement")
     return report
 
 
 def collect_scales(binary, file_counts, depth=40, repetitions=9, require_tools=False,
                    fixture_parent=None, require_memory=False, cpu_counts=(1, 4), require_cpu_affinity=False, keep=None, fixtures=None,
-                   shard_plan=None, shard_index=0, progress=None, layouts=None):
+                   shard_plan=None, shard_index=0, progress=None, layouts=None, resource_launcher=None):
     """Retain independent scales without mixing sample populations or tool identities."""
     if not file_counts or len(set(file_counts)) != len(file_counts) or min(file_counts) < 1 or depth < 1:
         raise ValueError("file counts must be unique and positive; depth must be positive")
@@ -391,7 +360,8 @@ def collect_scales(binary, file_counts, depth=40, repetitions=9, require_tools=F
                              require_cpu_affinity=require_cpu_affinity, keep=keep, progress=progress, shapes=shapes,
                              round_offset=shard_index * sampling[0] if sampling else 0,
                              fixtures={shape: value for (shape, count), value in fixtures.items() if count == files}
-                             if fixtures is not None else None, prepared_fixtures=prepared_fixtures)
+                             if fixtures is not None else None, prepared_fixtures=prepared_fixtures,
+                             resource_launcher=resource_launcher)
             completed_scales += 1
             progress(f'Workers: {cpus} Files: {files:,} Completed scale: {completed_scales}/{total_scales}', force=True)
             for task in report["tasks"]:
@@ -410,6 +380,8 @@ def collect_scales(binary, file_counts, depth=40, repetitions=9, require_tools=F
             else:
                 if report["tools"] != combined["tools"]:
                     raise ValueError("tool identity changed between fixture scales")
+                if report.get("resource_launcher") != combined.get("resource_launcher"):
+                    raise ValueError("native resource launcher changed between fixture scales")
                 combined["contract"]["affinity_by_cpu_count"][str(cpus)] = report["contract"].get("cpu_affinity")
                 combined["tasks"].extend(report["tasks"])
     finally:
@@ -433,6 +405,9 @@ def collect_scales(binary, file_counts, depth=40, repetitions=9, require_tools=F
 def render(report):
     if report["schema"] != 1:
         raise ValueError("unsupported comparison schema")
+    accounting = report.get("resource_launcher")
+    method = report["contract"].get("resource_accounting")
+    process_resources.validate_accounting_contract(accounting, method)
     if report["contract"]["repetitions"] < 1 or not report["tasks"]:
         raise ValueError("empty comparison report")
     rows = []
@@ -464,6 +439,15 @@ def render(report):
             if len(entry["samples"]) != report["contract"]["repetitions"]:
                 raise ValueError("missing tool comparison samples")
             for sample in entry["samples"]:
+                if accounting is not None:
+                    process_resources.validate_usage(
+                        {"rss_bytes": sample.get("child_peak_rss_bytes"), "exit_codes": sample["exit_codes"],
+                         "user_cpu_seconds": sample["user_cpu_seconds"],
+                         "system_cpu_seconds": sample["system_cpu_seconds"]}, len(entry["pipeline"]))
+                    rss = sample["child_peak_rss_bytes"]
+                    expected_peak = rss[0] if len(rss) == 1 else None
+                    if sample["peak_child_rss_bytes"] != expected_peak or sample["sum_child_peak_rss_bytes"] != sum(rss):
+                        raise ValueError("native process peaks do not match aggregate memory metrics")
                 if sample["stderr"] or any(code not in (0, 1) for code in sample["exit_codes"]):
                     raise ValueError("failed comparison sample")
                 if any(value is not None and (not isinstance(value, (int, float)) or not math.isfinite(value) or value < 0)
@@ -497,7 +481,13 @@ def average_cell(metric, scale):
             rows.append(skipped)
             overview.append(skipped.replace('colspan="6"', 'colspan="7"'))
     layout_text = ('<p><strong>Layouts:</strong> ' + html.escape(layout_labels) + '</p>' if layout_labels else '')
+    accounting_note = (
+        'Native resource accounting: ' + accounting['memory_method'] + '. ' + accounting['wall_method'] +
+        '. Launcher SHA-256: ' + accounting['sha256'] + '.' if accounting is not None else
+        'Legacy Python-launcher RSS can include its pre-exec footprint, confirmed by native Linux controls. '
+        'Do not interpret the small-command floor as tool allocation or mix accounting methods.')
     return (benchmark_overview.render_html(report) + layout_text +
+            '<p><strong>Resource accounting:</strong> ' + html.escape(accounting_note) + '</p>' +
             '<h2>Tool comparisons</h2><p>Correctness-checked batch tasks; no ranking or interactive comparison. '
             'Overview: selected averages in ms and MiB (legacy reports use medians); raw-sample details: seconds and bytes. Pipeline memory is a sum of process high-water marks, '
             'not simultaneous peak memory. No cross-scope ratios.</p><details><summary>Tools and contract</summary><pre>' +
@@ -533,6 +523,8 @@ def main():
     parser.add_argument('--shard-plan', type=Path, help='Use a shared fixture or sample shard plan')
     parser.add_argument('--shard-index', type=int, help='Zero-based shard index; requires --shard-plan')
     parser.add_argument('--worker', type=Path)
+    parser.add_argument('--resource-launcher', type=Path,
+                        help='Explicit prebuilt native accounting binary for direct script use')
     parser.add_argument('--binary', type=Path)
     parser.add_argument('--report', type=Path, help='Existing history report to extend')
     parser.add_argument('--files', type=int, action='append', help='Repeat for each scale; default: 1-2-5 progression from 10 through 10000')
@@ -593,7 +585,7 @@ def main():
     record = json.loads(args.report.read_text()) if args.report.exists() else {"head": args.head}
     record['tool_comparisons'] = collect_scales(
         args.binary, file_counts, args.depth, args.repetitions, require_tools=args.require_tools,
-        fixture_parent=args.fixture_parent, require_memory=args.require_memory,
+        fixture_parent=args.fixture_parent, require_memory=args.require_memory, resource_launcher=args.resource_launcher,
         cpu_counts=cpu_counts, require_cpu_affinity=args.require_cpu_affinity, keep=args.keep, fixtures=fixtures,
         shard_plan=shard_plan, shard_index=args.shard_index or 0)
     report = record["tool_comparisons"]
diff --git a/tools/benchmark_compare_test.py b/tools/benchmark_compare_test.py
index 4378480ea78..322936b30b9 100644
--- a/tools/benchmark_compare_test.py
+++ b/tools/benchmark_compare_test.py
@@ -219,6 +219,12 @@ def report(binary, files, depth, repetitions, **kwargs):
         with mock.patch.object(compare, 'collect', side_effect=[first, second]):
             with self.assertRaisesRegex(ValueError, 'identity changed'):
                 compare.collect_scales(Path('/xff'), [10, 100], depth=2, cpu_counts=(1,))
+        first, second = report(None, 10, 2, 1), report(None, 100, 2, 1)
+        first['resource_launcher'] = {'sha256': 'a' * 64}
+        second['resource_launcher'] = {'sha256': 'b' * 64}
+        with mock.patch.object(compare, 'collect', side_effect=[first, second]):
+            with self.assertRaisesRegex(ValueError, 'resource launcher changed'):
+                compare.collect_scales(Path('/xff'), [10, 100], depth=2, cpu_counts=(1,))
         for counts in ([], [0], [10, 10]):
             with self.subTest(counts=counts), self.assertRaises(ValueError):
                 compare.collect_scales(Path('/xff'), counts, depth=2)
@@ -416,13 +422,40 @@ def test_actual_xff_matches_independent_oracle(self):
         self.assertTrue(all(task['skips'] for task in result['tasks'] if task['name'] != 'files-safe'))
         self.assertTrue(all(not task['skips'] for task in result['tasks'] if task['name'] == 'files-safe'))
         page = compare.render(result)
+        self.assertEqual(result['contract']['resource_accounting'],
+                         {key: value for key, value in result['resource_launcher'].items() if key != 'path'})
         self.assertIn('Tool comparisons', page)
         self.assertIn('Input files/s', page)
         self.assertIn('Skipped:', page)
+        self.assertIn('Native resource accounting:', page)
+        self.assertIn(result['resource_launcher']['memory_method'], page)
+        self.assertIn(result['resource_launcher']['wall_method'], page)
+        self.assertIn('Launcher SHA-256: ' + result['resource_launcher']['sha256'], page)
+        legacy = copy.deepcopy(result)
+        del legacy['resource_launcher']
+        del legacy['contract']['resource_accounting']
+        legacy_page = compare.render(legacy)
+        self.assertIn('Legacy Python-launcher RSS can include its pre-exec footprint', legacy_page)
+        self.assertNotIn('Native resource accounting:', legacy_page)
+        escaped = copy.deepcopy(result)
+        untrusted_method = '<script>accounting</script>'
+        escaped['resource_launcher']['memory_method'] = untrusted_method
+        escaped['contract']['resource_accounting']['memory_method'] = untrusted_method
+        escaped_page = compare.render(escaped)
+        self.assertIn('&lt;script&gt;accounting&lt;/script&gt;', escaped_page)
+        self.assertNotIn(untrusted_method, escaped_page)
         broken = copy.deepcopy(result)
         broken['tasks'][0]['participants']['xff']['samples'] = []
         with self.assertRaisesRegex(ValueError, 'missing'):
             compare.render(broken)
+        broken = copy.deepcopy(result)
+        broken['resource_launcher']['sha256'] = '0' * 64
+        with self.assertRaisesRegex(ValueError, 'accounting contract'):
+            compare.render(broken)
+        broken = copy.deepcopy(result)
+        broken['tasks'][0]['participants']['xff']['samples'][0]['sum_child_peak_rss_bytes'] += 1
+        with self.assertRaisesRegex(ValueError, 'aggregate memory'):
+            compare.render(broken)
 
 
 if __name__ == '__main__':
diff --git a/tools/benchmark_datasets.py b/tools/benchmark_datasets.py
index bc7e907aff7..98f5fc335bd 100644
--- a/tools/benchmark_datasets.py
+++ b/tools/benchmark_datasets.py
@@ -75,6 +75,8 @@ def build_catalog(root):
                       cpu_count=report['contract'].get('cpu_count'),
                       affinity=report['contract'].get('affinity_by_cpu_count'),
                       storage=report['contract'].get('storage'))
+        if 'resource_accounting' in report['contract']:
+            method['resource_accounting'] = report['contract']['resource_accounting']
         method_id = identity(method)
         dataset['methods'][method_id] = method
         dataset['observations'].append(dict(commit=commit, date=records.reference_time(record),
diff --git a/tools/benchmark_datasets_test.py b/tools/benchmark_datasets_test.py
index 2d8ccea4766..5ca516440bc 100644
--- a/tools/benchmark_datasets_test.py
+++ b/tools/benchmark_datasets_test.py
@@ -45,6 +45,28 @@ def observations(root):
 
 
 class BenchmarkDatasetsTest(unittest.TestCase):
+    def test_native_accounting_adds_a_method_without_hiding_historical_observations(self):
+        with tempfile.TemporaryDirectory() as temporary:
+            root = Path(temporary)
+            observations(root)
+            original = datasets.build_catalog(root)['datasets'][0]
+            path = root / ('local/mac/batch/' + 'b' * 40 + '/report.json')
+            record = json.loads(path.read_text())
+            accounting = {'sha256': 'a' * 64, 'memory_method': 'native fork/wait4 v1',
+                          'wall_method': 'native boundary included'}
+            record['tool_comparisons']['contract']['resource_accounting'] = accounting
+            path.write_text(json.dumps(record))
+            catalog = datasets.build_catalog(root)
+            self.assertEqual(len(catalog['datasets']), 1)
+            current = catalog['datasets'][0]
+            self.assertEqual(current['id'], original['id'])
+            self.assertEqual(current['recipe'], original['recipe'])
+            self.assertEqual(len(current['observations']), 2)
+            self.assertEqual(len(current['methods']), 2)
+            methods = {item['commit']: current['methods'][item['method']] for item in current['observations']}
+            self.assertNotIn('resource_accounting', methods['a' * 40])
+            self.assertEqual(methods['b' * 40]['resource_accounting'], accounting)
+
     def test_publish_groups_workloads_preserves_methods_and_survives_compaction(self):
         with tempfile.TemporaryDirectory() as temporary:
             root = Path(temporary)
diff --git a/tools/benchmark_history_test.py b/tools/benchmark_history_test.py
index ac538e34465..a85fdd5c32c 100644
--- a/tools/benchmark_history_test.py
+++ b/tools/benchmark_history_test.py
@@ -227,6 +227,36 @@ def test_pr_and_main_measurements_use_the_same_runner_identity(self):
         self.assertIn("platform: linux\n            os: ubuntu-latest", main)
         self.assertIn("platform: macos\n            os: macos-latest", main)
 
+    def test_ci_shards_receive_the_prebuilt_native_resource_launcher(self):
+        for workflow, job in (('.github/workflows/main.yml', 'benchmark-build'),
+                              ('.github/workflows/benchmarks.yml', 'build')):
+            with self.subTest(workflow=workflow):
+                source = repository_file(workflow).read_text().split('\n  ' + job + ':', 1)[1]
+                source = re.split(r'\n  [a-z][a-z-]*:', source, maxsplit=1)[0]
+                self.assertIn('bazel cquery //tools:process_resources_native --config=clang_release', source)
+                self.assertIn('cp "${launcher}" "${RUNNER_TEMP}/benchmark-resource-launcher"', source)
+                self.assertIn('tar -cf benchmark-build.tar -C "${RUNNER_TEMP}" '
+                              'benchmark-head benchmark-resource-launcher', source)
+                # The paired main driver already builds the helper through its data dependency.
+                self.assertIn('//tools:benchmark_resources' if job == 'build'
+                              else '//tools:process_resources_native', source)
+        action = repository_file('.github/actions/benchmark-measure/action.yml').read_text()
+        self.assertIn('test -x "${RUNNER_TEMP}/benchmark-resource-launcher"', action)
+        self.assertIn('--resource-launcher="${RUNNER_TEMP}/benchmark-resource-launcher"', action)
+        self.assertNotIn('bazel build', action)
+        self.assertNotIn('bazel run', action)
+
+    def test_ci_backfill_builds_native_launcher_before_freezing_and_measuring(self):
+        source = repository_file('.github/workflows/benchmark_backfill.yml').read_text()
+        build = source.index('bazel build //tools:process_resources_native --config=clang_release')
+        query = source.index('bazel cquery //tools:process_resources_native --config=clang_release')
+        copy = source.index('cp "${launcher}" "${RUNNER_TEMP}/benchmark-resource-launcher"')
+        run = source.index('python3 tools/benchmark_campaign.py run')
+        self.assertLess(build, query)
+        self.assertLess(query, copy)
+        self.assertLess(copy, run)
+        self.assertIn('--resource-launcher="${RUNNER_TEMP}/benchmark-resource-launcher"', source[run:])
+
     def test_pr_and_main_aggregation_attach_only_earlier_main_baselines(self):
         for workflow, job in (('.github/workflows/benchmarks.yml', 'aggregate'),
                               ('.github/workflows/main.yml', 'benchmark-aggregate')):
diff --git a/tools/benchmark_matrix_test.py b/tools/benchmark_matrix_test.py
index 585a648defd..9a53bb853b1 100644
--- a/tools/benchmark_matrix_test.py
+++ b/tools/benchmark_matrix_test.py
@@ -25,6 +25,21 @@ def report(times=(1, 2, 3, 4, 5, 6, 7, 80, 100), keep=7):
 
 
 class BenchmarkMatrixTest(unittest.TestCase):
+    def test_resource_accounting_methods_never_share_a_main_baseline(self):
+        native = {"sha256": "a" * 64, "memory_method": "native fork/wait4 v1", "wall_method": "native boundary included"}
+        for previous_method in (None, dict(native, sha256="b" * 64),
+                                dict(native, wall_method="native boundary excluded"), native):
+            with self.subTest(method=previous_method), tempfile.TemporaryDirectory() as temporary:
+                previous, current = report(), report()
+                if previous_method is not None:
+                    previous['contract']['resource_accounting'] = previous_method
+                current['contract']['resource_accounting'] = native
+                root = Path(temporary)
+                self.retain(root, previous)
+                matrix.attach_baseline(current, root)
+                expected = 'available' if previous_method == native else 'unavailable'
+                self.assertEqual(current['baseline']['status'], expected)
+
     def test_platform_title_uses_recorded_identity(self):
         data = report()
         data['contract'].update(platform='macOS-26.6-arm64', machine='arm64')
diff --git a/tools/benchmark_normalization_test.py b/tools/benchmark_normalization_test.py
index b3d20078797..98c18869e32 100644
--- a/tools/benchmark_normalization_test.py
+++ b/tools/benchmark_normalization_test.py
@@ -64,6 +64,8 @@ def test_changed_reference_fixture_allocation_or_machine_does_not_enter_window(s
                 lambda report: report['contract'].update(runner_class='different-host'),
                 lambda report: report['contract'].update(storage={'filesystem': 'disk'}),
                 lambda report: report['contract'].update(affinity_by_cpu_count={'1': None}),
+                lambda report: report['contract'].update(resource_accounting={
+                    'sha256': 'a' * 64, 'memory_method': 'native fork/wait4 v1', 'wall_method': 'native boundary included'}),
                 lambda report: report['tasks'][0]['participants']['rg'].update(pipeline=[['rg', '--different']])):
             with self.subTest(change=change):
                 inputs = records(6)
diff --git a/tools/benchmark_resources.py b/tools/benchmark_resources.py
index 619bd004cfa..79801c7cecd 100644
--- a/tools/benchmark_resources.py
+++ b/tools/benchmark_resources.py
@@ -64,6 +64,8 @@ def main() -> int:
     parser.add_argument("--repetitions", type=positive, default=3)
     parser.add_argument("--jobs", type=positive, default=1)
     parser.add_argument("--build-label", default="unspecified", help="Source revision and build configuration")
+    parser.add_argument("--resource-launcher", type=Path,
+                        help="Explicit prebuilt native accounting binary for direct script use")
     args = parser.parse_args()
     if args.depth > args.files:
         parser.error("--depth must not exceed --files")
@@ -91,6 +93,8 @@ def main() -> int:
         harness = [runfiles.Create().Rlocation("_main/tools/measure_resources")]
     else:
         harness = [sys.executable, str(Path(__file__).with_name("measure_resources.py"))]
+    if args.resource_launcher is not None:
+        harness += ["--resource-launcher", str(args.resource_launcher.resolve(strict=True))]
     with tempfile.TemporaryDirectory(prefix="xff-resources-", dir=args.directory) as temporary:
         base = Path(temporary).resolve()
         report["fixture"]["directory"] = str(base)
diff --git a/tools/benchmark_shards.py b/tools/benchmark_shards.py
index 54a2ab1dce0..c28193037bf 100644
--- a/tools/benchmark_shards.py
+++ b/tools/benchmark_shards.py
@@ -11,6 +11,7 @@
 
 import benchmark_matrix
 import benchmark_records
+import process_resources
 
 
 def fixture_key(task):
@@ -158,6 +159,8 @@ def merge_reports(records, baseline_root=None, baseline_revisions=None, *, allow
     task_names = set(plan['task_names'])
     provenance = []
     for record, report in zip(records, reports, strict=True):
+        process_resources.validate_accounting_contract(report.get('resource_launcher'),
+                                                       report['contract'].get('resource_accounting'))
         if 'baseline' in report:
             raise ValueError('attach historical baselines after merging shards')
         current = copy.deepcopy(report['contract'])
@@ -208,6 +211,8 @@ def merge_reports(records, baseline_root=None, baseline_revisions=None, *, allow
                 raise ValueError('incomplete task set')
         provenance.append({'index': index, 'contract': report['contract'], 'tools': report['tools'],
                            'host_id': report.get('host_id')})
+        if 'resource_launcher' in report:
+            provenance[-1]['resource_launcher'] = dict(report['resource_launcher'])
     if (not allow_sample_subset and indices != set(range(len(plan['shards'])))):
         raise ValueError('missing shard index')
     combined['contract'] = dict(contract, affinity_by_cpu_count=affinity)
diff --git a/tools/benchmark_shards_test.py b/tools/benchmark_shards_test.py
index 25831f09618..4e6361bca2d 100644
--- a/tools/benchmark_shards_test.py
+++ b/tools/benchmark_shards_test.py
@@ -43,6 +43,36 @@ def records(cpus=(1, 4), count=3, partition='balanced', repetitions=9, keep=7, *
 
 
 class BenchmarkShardsTest(unittest.TestCase):
+    def native_records(self):
+        inputs = records(partition='samples')
+        for index, record in enumerate(inputs):
+            report = record['tool_comparisons']
+            report['resource_launcher'] = dict(
+                path=f'/host-{index}/native-launcher', sha256='a' * 64,
+                memory_method=shards.process_resources.MEMORY_METHOD,
+                wall_method=shards.process_resources.WALL_METHOD)
+            report['contract']['resource_accounting'] = {
+                key: value for key, value in report['resource_launcher'].items() if key != 'path'}
+        return inputs
+
+    def test_native_shards_retain_each_host_launcher_path_without_splitting_the_method(self):
+        inputs = self.native_records()
+        result = shards.merge_reports(inputs)
+        self.assertEqual([shard['resource_launcher']['path'] for shard in result['measurement_shards']],
+                         [f'/host-{index}/native-launcher' for index in range(3)])
+        self.assertEqual(inputs, self.native_records())
+
+    def test_each_native_shard_must_match_its_frozen_accounting_contract(self):
+        for change in (
+                lambda report: report.pop('resource_launcher'),
+                lambda report: report['resource_launcher'].update(sha256='b' * 64),
+                lambda report: report['contract']['resource_accounting'].update(memory_method='different'),
+                lambda report: report['resource_launcher'].update(path='')):
+            inputs = self.native_records()
+            change(inputs[1]['tool_comparisons'])
+            with self.subTest(change=change), self.assertRaisesRegex(ValueError, 'resource accounting|resource launcher'):
+                shards.merge_reports(inputs)
+
     def test_sample_shards_each_own_the_entire_matrix(self):
         plan = shards.make_plan([10, 100, 1000], [1, 3], 3, task_names=['files'], partition='samples')
         expected = {(files, cpu, shape) for files in (10, 100, 1000) for cpu in (1, 3) for shape in ('broad', 'deep')}
diff --git a/tools/measure_resources.py b/tools/measure_resources.py
index f20e8d0b365..e7b29182a78 100644
--- a/tools/measure_resources.py
+++ b/tools/measure_resources.py
@@ -8,50 +8,32 @@
 import json
 import os
 import platform
-import resource
-import subprocess
 import sys
-import tempfile
-import time
 
+import process_resources
 
-def measure(command: list[str]) -> dict[str, object]:
-    """Drain stdout without retaining it; stderr goes to disk to avoid pipe deadlock."""
-    started = time.monotonic()
-    first_output = None
-    output_bytes = 0
-    usage_before = resource.getrusage(resource.RUSAGE_CHILDREN)
-    with tempfile.TemporaryFile() as errors:
-        with subprocess.Popen(command, stdout=subprocess.PIPE, stderr=errors) as child:
-            assert child.stdout is not None
-            first = child.stdout.read(1)
-            if first:
-                first_output = time.monotonic() - started
-                output_bytes = 1
-            while chunk := child.stdout.read(65536):
-                output_bytes += len(chunk)
-            exit_code = child.wait()
-        elapsed = time.monotonic() - started
-        errors.seek(0, os.SEEK_END)
-        stderr_bytes = errors.tell()
-        errors.seek(max(0, stderr_bytes - 32768))
-        stderr_tail = errors.read().decode("utf-8", errors="replace")
-    usage = resource.getrusage(resource.RUSAGE_CHILDREN)
-    # getrusage reports bytes on Darwin, KiB on Linux. No other platform is supported.
-    memory_scale = 1 if sys.platform == "darwin" else 1024
+
+def measure(command: list[str], *, launcher=None) -> dict[str, object]:
+    """Account for this command, not Python or an earlier command's high-water mark."""
+    identity = process_resources.launcher_identity(launcher)
+    sample = process_resources.measure_pipeline([command], launcher=identity["path"],
+                                               retain_output=False, stderr_limit=32768)
+    if process_resources.launcher_identity(identity["path"]) != identity:
+        raise ValueError("native resource launcher changed during measurement")
     return {
         "command": command,
         "cwd": os.getcwd(),
         "platform": platform.platform(),
-        "elapsed_seconds": elapsed,
-        "first_stdout_seconds": first_output,
-        "stdout_bytes": output_bytes,
-        "stderr_bytes": stderr_bytes,
-        "stderr_tail": stderr_tail,
-        "exit_code": exit_code,
-        "user_cpu_seconds": usage.ru_utime - usage_before.ru_utime,
-        "system_cpu_seconds": usage.ru_stime - usage_before.ru_stime,
-        "peak_child_rss_bytes": usage.ru_maxrss * memory_scale,
+        "elapsed_seconds": sample["elapsed_seconds"],
+        "first_stdout_seconds": sample["first_stdout_seconds"],
+        "stdout_bytes": sample["stdout_bytes"],
+        "stderr_bytes": sample["stderr_bytes"],
+        "stderr_tail": sample["stderr"],
+        "exit_code": sample["exit_codes"][0],
+        "user_cpu_seconds": sample["user_cpu_seconds"],
+        "system_cpu_seconds": sample["system_cpu_seconds"],
+        "peak_child_rss_bytes": sample["peak_child_rss_bytes"],
+        "resource_launcher": identity,
         "cache_state": "unspecified",
     }
 
@@ -59,6 +41,7 @@ def measure(command: list[str]) -> dict[str, object]:
 def main() -> int:
     parser = argparse.ArgumentParser(description=__doc__)
     parser.add_argument("--cache-state", default="unspecified", help="User-supplied label; no cache flushing is done")
+    parser.add_argument("--resource-launcher", help="Explicit prebuilt native accounting binary for direct script use")
     parser.add_argument("command", nargs=argparse.REMAINDER, help="Command and arguments, after --")
     args = parser.parse_args()
     command = args.command
@@ -69,8 +52,8 @@ def main() -> int:
     if sys.platform not in {"darwin", "linux"}:
         parser.error("memory units are supported only on macOS and Linux")
     try:
-        result = measure(command)
-    except OSError as error:
+        result = measure(command, launcher=args.resource_launcher)
+    except (OSError, ValueError) as error:
         parser.exit(2, f"cannot start command: {error}\n")
     result["cache_state"] = args.cache_state
     print(json.dumps(result, sort_keys=True))
diff --git a/tools/measure_resources_test.py b/tools/measure_resources_test.py
index 2e77bda06f8..0fcdbcf71c9 100644
--- a/tools/measure_resources_test.py
+++ b/tools/measure_resources_test.py
@@ -10,6 +10,8 @@
 import sys
 import unittest
 
+import measure_resources
+
 
 @unittest.skipUnless(sys.platform in {"darwin", "linux"}, "resource units are platform-specific")
 class MeasureResourcesTest(unittest.TestCase):
@@ -35,6 +37,15 @@ def test_output_and_observed_latency(self):
         self.assertGreaterEqual(result["first_stdout_seconds"], 0)
         self.assertLessEqual(result["first_stdout_seconds"], result["elapsed_seconds"])
         self.assertGreater(result["peak_child_rss_bytes"], 0)
+        self.assertEqual(len(result["resource_launcher"]["sha256"]), 64)
+        self.assertIn("native pipeline fork/wait4", result["resource_launcher"]["memory_method"])
+
+    def test_imported_calls_do_not_reuse_an_earlier_child_peak(self):
+        large = measure_resources.measure([sys.executable, "-c",
+            "block = bytearray(64 * 1024 * 1024); "
+            "block[::4096] = b'x' * (len(block) // 4096); print(block[0])"])
+        small = measure_resources.measure([sys.executable, "-c", "pass"])
+        self.assertLess(small["peak_child_rss_bytes"], large["peak_child_rss_bytes"])
 
     def test_empty_stdout_is_not_zero_latency(self):
         status, result = self.run_measurement("pass")
diff --git a/tools/process_resources.py b/tools/process_resources.py
new file mode 100644
index 00000000000..a1e60e5e418
--- /dev/null
+++ b/tools/process_resources.py
@@ -0,0 +1,158 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: Copyright (c) M. Boerger, the MBO Works authors
+# SPDX-License-Identifier: Apache-2.0
+"""Account for direct pipeline commands through a small native launch boundary."""
+
+import hashlib
+import json
+import math
+import os
+from pathlib import Path
+import re
+import subprocess
+import sys
+import tempfile
+import time
+
+MEMORY_METHOD = "native pipeline fork/wait4 v1; native pre-exec footprint included; launcher usage excluded"
+WALL_METHOD = "monotonic wall time includes native launcher startup, output draining and teardown"
+
+
+def resolve_launcher(launcher=None):
+    """Resolve a declared runfile or an explicit binary; never build during measurement."""
+    if launcher is not None:
+        path = Path(launcher).resolve(strict=True)
+    else:
+        path = None
+        try:
+            from python.runfiles import runfiles
+            resolver = runfiles.Create()
+            # This canonical main-repository path needs no caller-based mapping.
+            # Direct-script subprocesses may import this module through its source
+            # symlink, outside the runfiles root used by CurrentRepository().
+            location = resolver.Rlocation("_main/tools/process_resources_native", source_repo="") if resolver else None
+            if location:
+                path = Path(location)
+        except ImportError:
+            pass
+        if path is None or not path.is_file():
+            raise ValueError("native resource launcher unavailable; build //tools:process_resources_native "
+                             "before measurement and supply its path explicitly")
+        path = path.resolve(strict=True)
+    if not path.is_file() or not os.access(path, os.X_OK):
+        raise ValueError("native resource launcher must be an executable file")
+    return path
+
+
+def launcher_identity(launcher=None):
+    path = resolve_launcher(launcher)
+    return {"path": str(path), "sha256": hashlib.sha256(path.read_bytes()).hexdigest(),
+            "memory_method": MEMORY_METHOD, "wall_method": WALL_METHOD}
+
+
+def validate_launcher_identity(identity):
+    if not isinstance(identity, dict) or set(identity) != {"path", "sha256", "memory_method", "wall_method"}:
+        raise ValueError("invalid native resource launcher identity")
+    if any(not isinstance(value, str) or not value for value in identity.values()):
+        raise ValueError("invalid native resource launcher identity fields")
+    if re.fullmatch("[0-9a-f]{64}", identity["sha256"]) is None:
+        raise ValueError("invalid native resource launcher hash")
+
+
+def validate_accounting_contract(identity, method):
+    """Preserve legacy reports; require matching method/hash for native reports."""
+    if identity is None and method is None:
+        return
+    validate_launcher_identity(identity)
+    if method != {key: value for key, value in identity.items() if key != "path"}:
+        raise ValueError("resource accounting contract does not match launcher identity")
+
+
+def validate_usage(usage, count):
+    if not isinstance(usage, dict):
+        raise ValueError("invalid native resource report")
+    for key in ("rss_bytes", "exit_codes"):
+        values = usage.get(key)
+        if not isinstance(values, list) or len(values) != count or any(type(value) is not int for value in values):
+            raise ValueError(f"invalid native {key} report")
+    if any(value < 0 for value in usage["rss_bytes"]):
+        raise ValueError("negative native peak RSS")
+    for key in ("user_cpu_seconds", "system_cpu_seconds"):
+        value = usage.get(key)
+        if type(value) not in {int, float} or not math.isfinite(value) or value < 0:
+            raise ValueError(f"invalid native {key} report")
+
+
+def measure_pipeline(commands, *, source=None, cwd=None, environment=None, launcher=None,
+                     retain_output=True, stderr_limit=None):
+    """Capture output and direct-command usage; the caller owns timeout/process-group policy.
+
+    The launcher inherits the caller's process group so an outer fresh-worker timeout
+    kills the entire pipeline. It handles termination by killing and reaping its own
+    commands. Wall time deliberately includes this extra native launch boundary;
+    reports must record that method and not normalize against the old launch method.
+    """
+    if sys.platform not in {"linux", "darwin"}:
+        raise ValueError("resource accounting supports macOS and Linux only")
+    if (not isinstance(commands, (list, tuple)) or not 1 <= len(commands) <= 16
+            or any(not isinstance(command, (list, tuple)) or not command for command in commands)):
+        raise ValueError("expected between one and sixteen nonempty commands")
+    if any(not isinstance(arg, str) or "\0" in arg for command in commands for arg in command):
+        raise ValueError("command arguments must be strings without NUL")
+    if any(not command[0] for command in commands):
+        raise ValueError("command executable must not be empty")
+    if stderr_limit is not None and (type(stderr_limit) is not int or stderr_limit < 0):
+        raise ValueError("stderr limit must be a nonnegative integer")
+    binary = resolve_launcher(launcher)
+    output_read, output_write = os.pipe()
+    chunks, first, output_bytes = [], None, 0
+    with os.fdopen(output_read, "rb") as output, tempfile.TemporaryFile() as errors:
+        argv = [str(binary), str(output_write), "" if cwd is None else os.fspath(cwd)]
+        for command in commands:
+            argv.extend([str(len(command)), *command])
+        child = None
+        try:
+            started = time.monotonic()
+            try:
+                child = subprocess.Popen(argv, stdin=source, stdout=subprocess.PIPE, stderr=errors,
+                                         env=environment, pass_fds=(output_write,))
+            finally:
+                os.close(output_write)
+            byte = output.read(1)
+            if byte:
+                first = time.monotonic() - started
+                output_bytes = 1
+                if retain_output:
+                    chunks.append(byte)
+            while chunk := output.read(65536):
+                output_bytes += len(chunk)
+                if retain_output:
+                    chunks.append(chunk)
+            report = child.stdout.read()
+            status = child.wait()
+            elapsed = time.monotonic() - started
+        finally:
+            if child is not None:
+                if child.poll() is None:
+                    child.terminate()
+                    try:
+                        child.wait(timeout=5)
+                    except subprocess.TimeoutExpired:
+                        child.kill()
+                        child.wait()
+                child.stdout.close()
+        errors.seek(0, os.SEEK_END)
+        stderr_bytes = errors.tell()
+        errors.seek(0 if stderr_limit is None else max(0, stderr_bytes - stderr_limit))
+        stderr = errors.read().decode("utf-8", errors="replace")
+    if status:
+        raise ValueError(f"native resource launcher failed ({status}): {stderr}")
+    usage = json.loads(report)
+    validate_usage(usage, len(commands))
+    rss = usage["rss_bytes"]
+    return {"elapsed_seconds": elapsed, "first_stdout_seconds": first,
+            "user_cpu_seconds": usage["user_cpu_seconds"], "system_cpu_seconds": usage["system_cpu_seconds"],
+            "peak_child_rss_bytes": rss[0] if len(rss) == 1 else None,
+            "sum_child_peak_rss_bytes": sum(rss), "child_peak_rss_bytes": rss,
+            "stdout_bytes": output_bytes, "exit_codes": usage["exit_codes"],
+            "stderr_bytes": stderr_bytes, "stderr": stderr, "output": b"".join(chunks)}
diff --git a/tools/process_resources_native.cc b/tools/process_resources_native.cc
new file mode 100644
index 00000000000..01fe37ef21a
--- /dev/null
+++ b/tools/process_resources_native.cc
@@ -0,0 +1,300 @@
+// SPDX-FileCopyrightText: Copyright (c) M. Boerger, the MBO Works authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Fork the measured pipeline only after exec has discarded Python's address space.
+// stdin/stderr and the output pipe are supplied by the caller; stdout carries JSON.
+// This adapter does not open or mutate host files and does not launch a shell.
+
+#include <fcntl.h>
+#include <sys/resource.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include <array>
+#include <cerrno>
+#include <csignal>
+#include <cstddef>
+#include <cstdint>
+#include <iomanip>
+#include <iostream>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "absl/strings/numbers.h"
+#include "mbo/status/status_macros.h"
+
+namespace {
+
+using Command = std::vector<std::string>;
+using Pipe = std::array<int, 2>;
+
+// POSIX signal handlers require shared signal-safe state.
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+volatile std::sig_atomic_t interrupted = 0;
+
+void Interrupt(int /*signal*/) {
+  interrupted = 1;
+}
+
+struct Request final {
+  int output_fd = -1;
+  std::string cwd;
+  std::vector<Command> commands;
+};
+
+absl::StatusOr<Request> ParseRequest(const std::vector<std::string>& arguments) {
+  Request request;
+  if (arguments.size() < 4 || !absl::SimpleAtoi(arguments[0], &request.output_fd) || request.output_fd <= 2) {
+    return absl::InvalidArgumentError("expected output pipe fd, cwd, and length-prefixed commands");
+  }
+  request.cwd = arguments[1];
+  std::size_t next = 2;
+  while (next < arguments.size()) {
+    std::size_t count = 0;
+    const std::string& count_argument = arguments[next++];
+    if (!absl::SimpleAtoi(count_argument, &count) || count == 0 || count > arguments.size() - next) {
+      return absl::InvalidArgumentError("invalid command argument count");
+    }
+    Command command;
+    command.reserve(count);
+    for (std::size_t index = 0; index < count; ++index) {
+      command.push_back(arguments[next++]);
+    }
+    if (command.front().empty() || request.commands.size() >= 16) {
+      return absl::InvalidArgumentError("expected nonempty executable and at most 16 commands");
+    }
+    request.commands.push_back(std::move(command));
+  }
+  return request;
+}
+
+absl::Status LastError(const std::string_view operation) {
+  return absl::ErrnoToStatus(errno, operation);
+}
+
+// XFF_HOST_IO: creates only an anonymous pipeline, never opens a host file.
+absl::StatusOr<Pipe> MakePipe() {
+  Pipe pipe_fds{};
+  // macOS has no pipe2; this single-threaded launcher closes unused endpoints before exec.
+  // NOLINTNEXTLINE(android-cloexec-pipe)
+  if (::pipe(pipe_fds.data()) != 0) {
+    return LastError("pipe");
+  }
+  // A caller may have closed stdin. Keep pipeline endpoints out of the stdio
+  // slots so dup2/ClosePipes cannot mistake a new pipe for inherited input.
+  for (int& fd : pipe_fds) {
+    if (fd <= STDERR_FILENO) {
+      // NOLINTNEXTLINE(cppcoreguidelines-pro-type-vararg): fcntl is the POSIX descriptor-duplication ABI.
+      const int replacement = ::fcntl(fd, F_DUPFD, STDERR_FILENO + 1);
+      if (replacement < 0) {
+        absl::Status status = LastError("duplicate pipe descriptor");
+        for (const int owned : pipe_fds) {
+          ::close(owned);
+        }
+        return status;
+      }
+      ::close(fd);
+      fd = replacement;
+    }
+  }
+  return pipe_fds;
+}
+
+struct ChildUsage final {
+  int exit_code = 0;
+  double user_seconds = 0;
+  double system_seconds = 0;
+  std::int64_t rss_bytes = 0;
+};
+
+absl::StatusOr<ChildUsage> WaitChild(pid_t pid) {
+  int status = 0;
+  rusage usage{};
+  pid_t result = -1;
+  for (;;) {
+    if (interrupted != 0) {
+      return absl::CancelledError("pipeline wait interrupted");
+    }
+    result = ::wait4(pid, &status, 0, &usage);
+    if (result >= 0) {
+      break;
+    }
+    if (errno != EINTR) {
+      return LastError("wait4");
+    }
+  }
+  if (!WIFEXITED(status) && !WIFSIGNALED(status)) {
+    return absl::InternalError("unexpected child wait status");
+  }
+  constexpr double kMicrosPerSecond = 1'000'000;
+#ifdef __APPLE__
+  constexpr std::int64_t kRssScale = 1;
+#else
+  constexpr std::int64_t kRssScale = 1'024;
+#endif
+  return ChildUsage{
+      .exit_code = WIFEXITED(status) ? WEXITSTATUS(status) : -WTERMSIG(status),
+      .user_seconds =
+          static_cast<double>(usage.ru_utime.tv_sec) + (static_cast<double>(usage.ru_utime.tv_usec) / kMicrosPerSecond),
+      .system_seconds =
+          static_cast<double>(usage.ru_stime.tv_sec) + (static_cast<double>(usage.ru_stime.tv_usec) / kMicrosPerSecond),
+      // NOLINTNEXTLINE(cppcoreguidelines-pro-type-union-access): the POSIX ru_maxrss ABI aliases a Linux union member.
+      .rss_bytes = usage.ru_maxrss * kRssScale,
+  };
+}
+
+class Pipeline final {
+ public:
+  Pipeline() = default;
+  Pipeline(const Pipeline&) = delete;
+  Pipeline& operator=(const Pipeline&) = delete;
+  Pipeline(Pipeline&&) = delete;
+  Pipeline& operator=(Pipeline&&) = delete;
+
+  // XFF_HOST_IO: releases owned anonymous-pipe descriptors and reaps owned processes.
+  ~Pipeline() {
+    ClosePipes();
+    for (const pid_t child : children_) {
+      if (child > 0) {
+        ::kill(child, SIGKILL);
+      }
+    }
+    for (const pid_t child : children_) {
+      if (child > 0) {
+        while (::waitpid(child, nullptr, 0) < 0 && errno == EINTR) {}
+      }
+    }
+  }
+
+  // XFF_HOST_IO: connects caller-authorized stdio; no host handles are opened.
+  absl::StatusOr<std::vector<ChildUsage>> Run(const Request& request) {
+    for (std::size_t index = 1; index < request.commands.size(); ++index) {
+      MBO_ASSIGN_OR_RETURN(const Pipe pipe_fds, MakePipe());
+      pipes_.push_back(pipe_fds);
+    }
+    children_.reserve(request.commands.size());
+    // The index connects commands with the preceding/following pipeline endpoints.
+    for (std::size_t index = 0; index < request.commands.size(); ++index) {
+      if (interrupted != 0) {
+        return absl::CancelledError("pipeline launch interrupted");
+      }
+      const pid_t child = ::fork();
+      if (child < 0) {
+        return LastError("fork");
+      }
+      if (child == 0) {
+        const int input = index == 0 ? STDIN_FILENO : pipes_[index - 1][0];
+        const int output = index + 1 == request.commands.size() ? request.output_fd : pipes_[index][1];
+        ExecCommand(request.commands[index], input, output, request.output_fd);
+      }
+      children_.push_back(child);
+    }
+    ClosePipes();
+    ::close(request.output_fd);
+    std::vector<ChildUsage> usages;
+    usages.reserve(children_.size());
+    for (pid_t& child : children_) {
+      MBO_ASSIGN_OR_RETURN(const ChildUsage usage, WaitChild(child));
+      child = -1;
+      usages.push_back(usage);
+    }
+    return usages;
+  }
+
+ private:
+  // XFF_HOST_IO: POSIX child adapter for inherited stdio and anonymous pipes, not host files.
+  [[noreturn]] void ExecCommand(const Command& command, int input, int output, int output_fd) {
+    if ((input != STDIN_FILENO && ::dup2(input, STDIN_FILENO) < 0) || ::dup2(output, STDOUT_FILENO) < 0) {
+      std::cerr << LastError("cannot connect measured command") << '\n';
+      ::_exit(127);
+    }
+    ClosePipes();
+    ::close(output_fd);
+    // XFF_ABI_POINTER: POSIX execvp requires a null-terminated char* argv; it does not mutate strings.
+    std::vector<char*> argv;
+    argv.reserve(command.size() + 1);
+    for (const std::string& argument : command) {
+      // NOLINTNEXTLINE(cppcoreguidelines-pro-type-const-cast): execvp requires mutable argv but does not write it.
+      argv.push_back(const_cast<char*>(argument.c_str()));
+    }
+    argv.push_back(nullptr);
+    ::execvp(command.front().c_str(), argv.data());
+    std::cerr << LastError("cannot exec " + command.front()) << '\n';
+    ::_exit(127);
+  }
+
+  // XFF_HOST_IO: closes only this adapter's anonymous-pipe descriptors.
+  void ClosePipes() {
+    for (const Pipe& pipe_fds : pipes_) {
+      ::close(pipe_fds[0]);
+      ::close(pipe_fds[1]);
+    }
+    pipes_.clear();
+  }
+
+  std::vector<Pipe> pipes_;
+  std::vector<pid_t> children_;
+};
+
+void Report(const std::vector<ChildUsage>& usages) {
+  double user = 0;
+  double system = 0;
+  for (const ChildUsage& usage : usages) {
+    user += usage.user_seconds;
+    system += usage.system_seconds;
+  }
+  std::cout << std::setprecision(17) << "{\"user_cpu_seconds\":" << user << ",\"system_cpu_seconds\":" << system
+            << ",\"rss_bytes\":[";
+  bool first = true;
+  for (const ChildUsage& usage : usages) {
+    std::cout << (first ? "" : ",") << usage.rss_bytes;
+    first = false;
+  }
+  std::cout << "],\"exit_codes\":[";
+  first = true;
+  for (const ChildUsage& usage : usages) {
+    std::cout << (first ? "" : ",") << usage.exit_code;
+    first = false;
+  }
+  std::cout << "]}\n";
+}
+
+// XFF_HOST_IO: changes only the launcher's process cwd; no host paths are mutated.
+absl::Status Run(const std::vector<std::string>& arguments) {
+  MBO_ASSIGN_OR_RETURN(const Request request, ParseRequest(arguments));
+  if (!request.cwd.empty() && ::chdir(request.cwd.c_str()) < 0) {
+    return LastError("chdir");
+  }
+  struct sigaction action{};
+  action.sa_handler = Interrupt;
+  // Darwin exposes sigemptyset as a function-like macro, so it cannot be qualified.
+  sigemptyset(&action.sa_mask);
+  if (::sigaction(SIGTERM, &action, nullptr) != 0 || ::sigaction(SIGINT, &action, nullptr) != 0) {
+    return LastError("sigaction");
+  }
+  Pipeline pipeline;
+  MBO_ASSIGN_OR_RETURN(const std::vector<ChildUsage> usages, pipeline.Run(request));
+  Report(usages);
+  return absl::OkStatus();
+}
+
+}  // namespace
+
+// XFF_ABI_POINTER: the process entry ABI requires char** argv; internal helpers use owned strings.
+int main(int argc, char** argv) {
+  std::vector<std::string> arguments;
+  for (int index = 1; index < argc; ++index) {
+    // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-pointer-arithmetic): indexing the process-entry argv ABI.
+    arguments.emplace_back(argv[index]);
+  }
+  const absl::Status status = Run(arguments);
+  if (!status.ok()) {
+    std::cerr << status << '\n';
+    return 2;
+  }
+  return 0;
+}
diff --git a/tools/process_resources_test.py b/tools/process_resources_test.py
new file mode 100644
index 00000000000..b47c7141240
--- /dev/null
+++ b/tools/process_resources_test.py
@@ -0,0 +1,218 @@
+#!/usr/bin/env python3
+# SPDX-FileCopyrightText: Copyright (c) M. Boerger, the MBO Works authors
+# SPDX-License-Identifier: Apache-2.0
+"""Exercise native command accounting, pipe lifetime and launcher memory isolation."""
+
+import json
+import os
+from pathlib import Path
+import resource
+import select
+import shutil
+import signal
+import subprocess
+import sys
+import tempfile
+import unittest
+
+import process_resources as resources
+
+
+def python_command(code):
+    return [sys.executable, "-c", code]
+
+
+@unittest.skipUnless(sys.platform in {"linux", "darwin"}, "native resource units are platform-specific")
+class ProcessResourcesTest(unittest.TestCase):
+    def test_output_diagnostics_exit_status_and_latency(self):
+        result = resources.measure_pipeline([python_command(
+            "import sys; sys.stdout.write('abc'); sys.stdout.flush(); sys.stderr.write('diagnostic'); sys.exit(7)")])
+        self.assertEqual(result["output"], b"abc")
+        self.assertEqual(result["stdout_bytes"], 3)
+        self.assertEqual(result["stderr"], "diagnostic")
+        self.assertEqual(result["stderr_bytes"], len("diagnostic"))
+        self.assertEqual(result["exit_codes"], [7])
+        self.assertGreaterEqual(result["first_stdout_seconds"], 0)
+        self.assertLessEqual(result["first_stdout_seconds"], result["elapsed_seconds"])
+        self.assertEqual(result["peak_child_rss_bytes"], result["sum_child_peak_rss_bytes"])
+        self.assertGreaterEqual(result["user_cpu_seconds"], 0)
+        self.assertGreaterEqual(result["system_cpu_seconds"], 0)
+
+    def test_pipeline_input_output_and_individual_peaks(self):
+        with tempfile.TemporaryFile() as source:
+            source.write(b"hello\0world\0")
+            source.seek(0)
+            result = resources.measure_pipeline([
+                python_command("import sys; sys.stdout.buffer.write(sys.stdin.buffer.read())"),
+                python_command("import sys; sys.stdout.buffer.write(sys.stdin.buffer.read().upper())"),
+            ], source=source)
+        self.assertEqual(result["output"], b"HELLO\0WORLD\0")
+        self.assertEqual(result["exit_codes"], [0, 0])
+        self.assertIsNone(result["peak_child_rss_bytes"])
+        self.assertEqual(len(result["child_peak_rss_bytes"]), 2)
+        self.assertEqual(result["sum_child_peak_rss_bytes"], sum(result["child_peak_rss_bytes"]))
+
+    def test_large_output_and_stderr_do_not_deadlock_or_require_output_retention(self):
+        result = resources.measure_pipeline([python_command(
+            "import sys; sys.stderr.write('e' * 1048576); sys.stdout.write('x' * 1048576)")],
+            retain_output=False, stderr_limit=32768)
+        self.assertEqual(result["output"], b"")
+        self.assertEqual(result["stdout_bytes"], 1048576)
+        self.assertEqual(result["stderr_bytes"], 1048576)
+        self.assertEqual(result["stderr"], "e" * 32768)
+        self.assertEqual(result["exit_codes"], [0])
+
+    def test_empty_output_and_signaled_exit(self):
+        result = resources.measure_pipeline([python_command("import os, signal; os.kill(os.getpid(), signal.SIGTERM)")])
+        self.assertEqual(result["exit_codes"], [-signal.SIGTERM])
+        self.assertEqual(result["stdout_bytes"], 0)
+        self.assertIsNone(result["first_stdout_seconds"])
+
+    def test_cwd_and_environment_reach_the_measured_command(self):
+        with tempfile.TemporaryDirectory() as temporary:
+            environment = dict(os.environ, RESOURCE_TEST_TOKEN="token")
+            result = resources.measure_pipeline([python_command(
+                "import json, os; print(json.dumps([os.getcwd(), os.environ['RESOURCE_TEST_TOKEN']]))")],
+                cwd=temporary, environment=environment)
+            self.assertEqual(json.loads(result["output"]), [str(Path(temporary).resolve()), "token"])
+
+    def test_missing_executable_reports_failure_and_diagnostic(self):
+        result = resources.measure_pipeline([["/nonexistent-xff-resource-test-command"]])
+        self.assertEqual(result["exit_codes"], [127])
+        self.assertIn("cannot exec /nonexistent-xff-resource-test-command", result["stderr"])
+
+    def test_invalid_cwd_reports_launcher_failure(self):
+        with self.assertRaisesRegex(ValueError, "native resource launcher failed.*chdir"):
+            resources.measure_pipeline([python_command("pass")], cwd="/nonexistent-xff-resource-test-cwd")
+
+    def test_pipeline_preserves_closed_stdin_without_aliasing_an_internal_pipe(self):
+        # Close stdin immediately before exec, after subprocess has connected
+        # its stdio. The helper's first pipe would otherwise occupy descriptor 0.
+        commands = [python_command("print('payload')"),
+                    python_command("import sys; sys.stdout.write(sys.stdin.read())")]
+        output_read, output_write = os.pipe()
+        argv = [str(resources.resolve_launcher()), str(output_write), ""]
+        for command in commands:
+            argv.extend([str(len(command)), *command])
+        wrapper = "import os, sys\ntry: os.close(0)\nexcept OSError: pass\nos.execv(sys.argv[1], sys.argv[1:])"
+        try:
+            child = subprocess.Popen([sys.executable, "-c", wrapper, *argv], stdout=subprocess.PIPE,
+                                     stderr=subprocess.PIPE, pass_fds=(output_write,))
+        finally:
+            os.close(output_write)
+        try:
+            with os.fdopen(output_read, "rb") as output:
+                ready, _, _ = select.select([output], [], [], 10)
+                self.assertTrue(ready, "closed-stdin pipeline did not finish")
+                self.assertEqual(output.read(), b"payload\n")
+            report, stderr = child.communicate(timeout=10)
+            self.assertEqual(child.returncode, 0, stderr)
+            self.assertEqual(json.loads(report)["exit_codes"], [0, 0])
+        finally:
+            if child.poll() is None:
+                child.terminate()
+            child.communicate(timeout=10)
+
+    @unittest.skipUnless(sys.platform == "linux", "Linux fork/exec inherited-RSS regression")
+    def test_python_high_water_mark_is_not_attributed_to_tiny_command(self):
+        native_true = shutil.which("true")
+        self.assertIsNotNone(native_true)
+        # Touch every page and retain it across launch; a direct Python fork/wait4
+        # would attribute this footprint to even /bin/true.
+        padding = bytearray(96 * 1024 * 1024)
+        padding[::4096] = b"x" * (len(padding) // 4096)
+        parent_peak = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss * 1024
+        result = resources.measure_pipeline([[native_true]])
+        self.assertLess(result["peak_child_rss_bytes"], parent_peak // 2)
+        self.assertEqual(padding[0], ord("x"))
+
+    def test_actual_command_allocation_is_not_discarded(self):
+        result = resources.measure_pipeline([python_command(
+            "block = bytearray(64 * 1024 * 1024); "
+            "block[::4096] = b'x' * (len(block) // 4096); print(block[0])")])
+        self.assertGreaterEqual(result["peak_child_rss_bytes"], 64 * 1024 * 1024)
+
+    @unittest.skipUnless(hasattr(os, "sched_getaffinity"), "native Linux affinity")
+    def test_cpu_affinity_is_inherited_by_native_children(self):
+        original = os.sched_getaffinity(0)
+        restricted = {min(original)}
+        try:
+            os.sched_setaffinity(0, restricted)
+            result = resources.measure_pipeline([python_command(
+                "import json, os; print(json.dumps(sorted(os.sched_getaffinity(0))))")])
+        finally:
+            os.sched_setaffinity(0, original)
+        self.assertEqual(json.loads(result["output"]), sorted(restricted))
+
+    def test_termination_reaps_inflight_commands(self):
+        output_read, output_write = os.pipe()
+        command = python_command(
+            "import os, signal; print(os.getpid(), flush=True); signal.pause()")
+        argv = [str(resources.resolve_launcher()), str(output_write), "", str(len(command)), *command]
+        child = subprocess.Popen(argv, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+                                 pass_fds=(output_write,), start_new_session=True)
+        os.close(output_write)
+        try:
+            with os.fdopen(output_read, "rb") as output:
+                ready, _, _ = select.select([output], [], [], 10)
+                self.assertTrue(ready, "measured command did not announce its PID")
+                pid = int(output.readline())
+                child.terminate()
+                stdout, stderr = child.communicate(timeout=10)
+                self.assertEqual(child.returncode, 2, (stdout, stderr))
+                with self.assertRaises(ProcessLookupError):
+                    os.kill(pid, 0)
+        finally:
+            # Own one isolated test process group, including any child left by a failure.
+            try:
+                os.killpg(child.pid, signal.SIGKILL)
+            except ProcessLookupError:
+                pass
+            child.communicate(timeout=10)
+
+
+class ProcessResourcesValidationTest(unittest.TestCase):
+    def test_accounting_contract_preserves_legacy_and_rejects_partial_or_mismatched_native_identity(self):
+        resources.validate_accounting_contract(None, None)
+        identity = dict(path="/launcher", sha256="a" * 64,
+                        memory_method=resources.MEMORY_METHOD, wall_method=resources.WALL_METHOD)
+        method = {key: value for key, value in identity.items() if key != "path"}
+        resources.validate_accounting_contract(identity, method)
+        resources.validate_accounting_contract(dict(identity, path="/other-host/launcher"), method)
+        for launcher, contract in ((None, method), (identity, None),
+                                   (dict(identity, sha256="b" * 64), method),
+                                   (identity, dict(method, wall_method="old launch boundary"))):
+            with self.subTest(launcher=launcher, contract=contract), self.assertRaises(ValueError):
+                resources.validate_accounting_contract(launcher, contract)
+
+    def test_invalid_commands_are_rejected_before_launch(self):
+        for commands in (None, [], [[]], ["true"], [[""]], [["true"]] * 17, [["true", "x\0y"]], [[b"true"]]):
+            with self.subTest(commands=commands), self.assertRaises(ValueError):
+                resources.measure_pipeline(commands)
+
+    def test_invalid_stderr_limits_are_rejected_before_launch(self):
+        for limit in (-1, True, 1.5, "1"):
+            with self.subTest(limit=limit), self.assertRaisesRegex(ValueError, "stderr limit"):
+                resources.measure_pipeline([["true"]], stderr_limit=limit)
+
+    def test_invalid_native_metadata_is_not_accepted(self):
+        valid = {"rss_bytes": [100], "exit_codes": [0], "user_cpu_seconds": 0, "system_cpu_seconds": 0}
+        bad_fields = {"rss_bytes": ([-1], [], [True]), "exit_codes": ([], ["0"]),
+                      "user_cpu_seconds": (float("nan"), float("inf"), -1, True)}
+        for key, values in bad_fields.items():
+            for value in values:
+                with self.subTest(key=key, value=value), self.assertRaises(ValueError):
+                    resources.validate_usage(dict(valid, **{key: value}), 1)
+
+    def test_invalid_launcher_identities_are_not_accepted(self):
+        valid = {"path": "/native-launcher", "sha256": "a" * 64,
+                 "memory_method": resources.MEMORY_METHOD, "wall_method": resources.WALL_METHOD}
+        resources.validate_launcher_identity(valid)
+        for identity in (None, {}, dict(valid, sha256="not-a-hash"), dict(valid, sha256="A" * 64),
+                         dict(valid, memory_method=""), dict(valid, path=1), dict(valid, extra="field")):
+            with self.subTest(identity=identity), self.assertRaises(ValueError):
+                resources.validate_launcher_identity(identity)
+
+
+if __name__ == "__main__":
+    unittest.main()