[DivyamTalwar]

Original ZIP gap addressed

Implements C06 / GAP-06, tracked in #54. Stacked on #49; this is JITMIND-only work. It does not claim the remaining closure issues or release gates are complete.

Changes

• Measure lookup, eligibility, ranking, rendering and deduplication independently in the actual preflight path.
• Use request-local exclusive timing, bounded invocation/outcome counters, explicit null/not-entered measurements, and finite clock-anomaly handling.
• Add immutable versioned metrics and an optional bounded, nonblocking in-memory sink. No exporter callback, network call, source content, identity, path or exception text is captured on the delivery path.
• Preserve authorization checkpoints, receipt identity, existing result states and the default 150 ms deadline.
• Keep observational metrics out of result equality/hash so existing value semantics are unchanged.
• Provide an executable recording-on/off benchmark and document the limitations of its synthetic workload.

Independent review correction

The frozen-candidate review reproduced one compatibility issue: timing metadata participated in dataclass equality/hash. This was fixed with field(default=None, compare=False) and two real-delivery regressions covering equality, sets/dictionaries and changed semantic-field controls. Other reviewed timing, cancellation, concurrency, receipt and privacy checks passed within the stated scope.

Actual verification

Candidate: 291bea4757930e27c44f685e9142d2ceb83cd36a.
Supervisor rerun on the exact corrected source bytes, macOS arm64 / Python 3.12.12, with provisioned real parser dependencies:

PYTHONPATH=$PWD python -m pytest -q -p no:cacheprovider
# 905 passed, 0 failed, 0 skipped; 3 expected optional-provider warnings
python -m compileall -q jitmind tests
python -m pip check
python -m ruff check --no-cache --isolated --select E9,F <changed Python files>
git diff --check
# all passed

The full count includes inherited tests, not 905 independent production scenarios. Source hashes were checked before/after verification and again before commit. The implementation worker and independent reviewer also ran the original 903-test candidate; those are historical pre-correction results, not additional distinct tests.

The retained 200-sample benchmark is explicitly tied to its pre-review source fingerprint. Its paired median recording overhead was approximately 0.047 ms on that local workload; it is not relabelled as a benchmark of this corrected commit or as a production latency guarantee. See docs/preflight-measurement.md and docs/closure/C06-interfaces.md.

Remaining boundaries

C05's new anchor-schema reader integration is a separate composed change. Full installed-feature, platform/provider, donor-comparison and independent release qualification remain tracked in #56. No live provider calls, production data operations or automatic merge. Merge prerequisites, retarget as appropriate and rerun CI on the resulting base.