ci: package Linux physics artifacts for Phase 3

.github/workflows/ost-source-ci.yml

@@ -441,6 +441,26 @@ jobs:
         env:
           CMAKE_PREFIX_PATH: ${{ env.JOLT_PREFIX }}
         run: ost test --target ${{ matrix.platform }} --profile ${{ matrix.profile }} ${{ matrix.intent_flags }}
+      - name: Verify and package Linux physics libraries
+        if: ${{ matrix.name == 'workspace-pr-linux' }}
+        shell: bash
+        env:
+          CMAKE_PREFIX_PATH: ${{ env.JOLT_PREFIX }}
+        run: |
+          set -euo pipefail
+          mkdir -p .ost-ci
+          for library in libs/physicsCore backends/physicsJolt; do
+            name="$(basename "$library")"
+            ost library build "$library" --target ${{ matrix.platform }} --profile ${{ matrix.profile }} --json > ".ost-ci/${name}-build.json"
+            ost library test "$library" --target ${{ matrix.platform }} --profile ${{ matrix.profile }} --json > ".ost-ci/${name}-test.json"
+            # Jolt's imported target needs the external Jolt SDK. The root
+            # installed-consumer test carries that SDK prefix; OpenStrata's
+            # generated consumer intentionally clears CMAKE_PREFIX_PATH.
+            if [ "$name" = physicsCore ]; then
+              ost library verify-consumer "$library" --target ${{ matrix.platform }} --profile ${{ matrix.profile }} --json > ".ost-ci/${name}-consumer.json"
+            fi
+            ost library package "$library" --target ${{ matrix.platform }} --profile ${{ matrix.profile }} --json > ".ost-ci/${name}-package.json"
+          done
       - name: Run the workspace verification pyramid
         if: ${{ matrix.verify == 'pyramid' || matrix.verify == 'package' }}
         shell: bash
@@ -454,10 +474,13 @@ jobs:
         uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
           name: report-${{ matrix.name }}
+          include-hidden-files: true
           path: |
             .strata/targets/
             **/.strata/reports/
             **/dist/plugins/
             **/dist/tools/
+            libs/physicsCore/dist/
+            backends/physicsJolt/dist/
             dist/products/
             .ost-ci/

docs/architecture/RELEASE_SCHEMA.md

@@ -2,7 +2,7 @@
 
 > **Status: proposed, 2026-09-23.** This defines the intended versioned
 > release contract; it does not claim that a tag, release workflow, or GitHub
-> release exists. The public Windows artifacts published during Phase 3 are
+> release exists. The public Windows and Linux artifacts published during Phase 3 are
 > consumer-validation inputs, not a complete `v0.1.0` release.
 
 ## 1. Release unit and scope
@@ -87,10 +87,11 @@ draft is reviewed and published.
 
 ## 4. Current boundary
 
-The existing public Windows `physicsCore` and `physicsJolt` OCI artifacts have
-been pulled and verified from a fresh cache for the Phase 3 migration. They
-remain valid exact-digest inputs for that consumer, but do not imply Linux
-availability or a formal versioned release. The first release workflow should
-be implemented and dry-run before any `v0.1.0` tag is pushed. Linux artifacts,
-cross-repository hosted consumer evidence, and a finalized release note are
-still required.
+The existing public Windows and Linux `physicsCore` and `physicsJolt` OCI
+artifacts have been pulled and verified from fresh caches for the Phase 3
+migration. They remain valid exact-digest inputs for that consumer, but do not
+constitute a formal versioned release. The cross-repository Stage Runner
+[hosted consumer run](https://github.com/animu-sphere/usd-stage-runner/actions/runs/35853380748)
+passed on Windows and Linux with artifact caches disabled. The first release
+workflow should be implemented and dry-run before any `v0.1.0` tag is pushed;
+a finalized release note is still required.

docs/reports/2026-09-23-phase3-linux-artifacts.md

@@ -0,0 +1,48 @@
+# 2026-09-23 Phase 3 Linux package artifacts
+
+## Scope
+
+The Linux cell of [GitHub Actions run 35852274531](https://github.com/animu-sphere/usd-physics-plugins/actions/runs/35852274531)
+passed the workspace suite, isolated `physicsCore` and `physicsJolt` builds and
+tests, `physicsCore` installed-consumer verification, and packaging on
+`ubuntu-24.04`. The workspace suite includes the Jolt installed-consumer test
+with the external Jolt SDK prefix. The Windows and graph cells also passed.
+
+The Linux packages use the pinned `cy2026` / `usd` runtime and Jolt Physics
+5.5.0 at `23dadd0e603f1b321142d4c74df07fce85064989`.
+
+## Published inputs
+
+The two package outputs were imported and checked with `ost artifact verify
+--require-sbom --require-provenance`, then published to the existing public
+`ghcr.io/animu-sphere/usd-physics-plugins` repository. A separate empty
+OpenStrata store pulled both by OCI digest with their expected content digest,
+kind, target, SBOM, and provenance requirements.
+
+| Package | Archive content digest | OCI manifest digest |
+| --- | --- | --- |
+| `physicsCore` | `sha256:81a3433b759e6ec817188a2137f8da24ff8dbebed09a176f48a7ec2596d6f5ad` | `sha256:f050253cea8f6db163b67c9860e88bdf213c8ef400956c29fec130bc4b6726d7` |
+| `physicsJolt` | `sha256:2be1f995f3e59d29fcc5a3db66321d4022fd83965d68f09e9b82b5b73bf2703b` | `sha256:e51df5e3815cbbe57034a390c6218f7467be70f92500b437eb7c77f2feda9020` |
+
+The published tags are discovery labels. Consumers must pin both digests for
+each package.
+
+## Verification boundary
+
+The first packaging run exposed that `ost library verify-consumer` clears
+`CMAKE_PREFIX_PATH` for its generated consumer, so it cannot find the external
+Jolt SDK required by `physicsJolt`. The passing run uses the root
+installed-consumer test for Jolt and retains the isolated generated consumer
+check for `physicsCore`.
+
+These artifacts are Phase 3 consumer inputs, not a versioned `v0.1.0` release.
+Stage Runner's hosted Windows and Linux consumer results and the release dry
+run remain separate gates.
+
+## Follow-up
+
+Later on 2026-09-23 UTC, Stage Runner's
+[hosted Windows and Linux run](https://github.com/animu-sphere/usd-stage-runner/actions/runs/35853380748)
+passed 46 tests per platform using the published packages with artifact caches
+disabled. Its separate plain-CMake run also passed. The versioned release dry
+run remains open.

docs/reports/README.md

@@ -9,3 +9,4 @@ remain in the [capability matrix](../reference/CAPABILITY_MATRIX.md).
 - [2026-09-22 Phase 2 Windows backend verification](2026-09-22-phase2-windows-backend.md)
 - [2026-09-22 Phase 2 Linux backend verification](2026-09-22-phase2-linux-backend.md)
 - [2026-09-23 Phase 2 hosted backend verification](2026-09-23-phase2-hosted-backend.md)
+- [2026-09-23 Phase 3 Linux package artifacts](2026-09-23-phase3-linux-artifacts.md)

docs/roadmap/current.md

@@ -47,16 +47,20 @@ installed physicsCore + physicsJolt
   path passed all 48 local Windows parity tests.
 - Published the pinned Windows packages as public, immutable OCI artifacts and
   verified both OCI and content digests from a fresh cache.
+- Published equivalent Linux packages and verified their content and OCI
+  digests from a fresh cache; see the
+  [Linux artifact report](../reports/2026-09-23-phase3-linux-artifacts.md).
+- Stage Runner passed hosted Windows and Linux OpenStrata consumer builds and
+  tests with artifact caches disabled, plus the plain-CMake hosted jobs;
+  [the consumer run](https://github.com/animu-sphere/usd-stage-runner/actions/runs/35853380748)
+  records both platform cells.
 
 ## 4. Remaining Phase 3 work
 
-- Produce and publish equivalent Linux package artifacts.
-- Run the Stage Runner hosted Windows and Linux suites from fresh artifact
-  caches and record the evidence.
 - Implement and dry-run the versioned release workflow against the
   [release schema](../architecture/RELEASE_SCHEMA.md) before creating a tag;
-  the currently published Windows artifacts are Phase 3 inputs, not a full
-  release.
+  the currently published Windows and Linux artifacts are Phase 3 inputs, not
+  a full release.
 
 ## 5. Phase 3 completion criteria