Use the individual commit comment generated for each PR. Do not squash PR_26152_199 through PR_26152_203 into a single commit.

Author: ToolboxAid

docs/dev/reports/runtime_determinism_validation.md

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+# Runtime Determinism Validation
+
+PR: PR_26152_200-runtime-determinism-validation
+Date: 2026-06-02
+
+## Scope
+
+- Validated deterministic runtime tick behavior.
+- Validated stable input, environment, terrain, movement, collision, and render order.
+- Validated repeatable outcomes from the same manifest input.
+
+## Validation
+
+Command:
+
+```powershell
+node tests/engine/RuntimeDeterminismValidation.test.mjs
+```
+
+Result: PASS.
+
+## Lanes Executed
+
+- engine - deterministic runtime outcome validation.
+- runtime - repeatable frame behavior only.
+
+## Lanes Skipped
+
+- samples - permanently out of scope.
+- tools - out of scope.
+- browser Playwright - not part of this headless engine validation.
+
+## Playwright
+
+Playwright impacted: No browser/tool UI impact. This PR validates headless engine deterministic outcomes through targeted Node tests.
+
+## Manual Validation
+
+Review `RuntimeDeterminismValidation.test.mjs` and confirm two identical manifest/input runs produce identical frames, objects, and render commands.
+
+## Blocker Scope
+
+No blocker for runtime determinism validation.

docs/dev/reports/runtime_engine_closeout.md

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+# Runtime Engine Closeout
+
+PR: PR_26152_203-runtime-engine-closeout
+Date: 2026-06-02
+
+## Scope
+
+- Closed the manifest-driven engine runtime lane.
+- Confirmed error reporting, determinism, fixture hardening, and playable scene UAT validation.
+- Documented remaining engine blockers only.
+- Defined the next lane after playable runtime.
+
+## Validation
+
+Commands:
+
+```powershell
+node tests/engine/RuntimeErrorReporting.test.mjs
+node tests/engine/RuntimeDeterminismValidation.test.mjs
+node tests/engine/RuntimeManifestFixtureHardening.test.mjs
+node tests/engine/RuntimePlayableSceneUat.test.mjs
+```
+
+Result: PASS.
+
+Additional static check:
+
+```powershell
+git diff --check
+```
+
+Result: PASS with one line-ending advisory for `tests/engine/RuntimeManifestDrivenFixture.mjs`; no whitespace error.
+
+## Lane Status
+
+| Area | Status | Notes |
+| --- | --- | --- |
+| Runtime error reporting | PASS | Visible reports cover manifest, object, terrain, environment, rule, input, collision, and render stages. |
+| Determinism | PASS | Identical manifest/input runs produce repeatable frame, object, and render output. |
+| Fixture hardening | PASS | Valid and invalid engine fixtures exist with no sample/tool fixture dependency. |
+| Playable scene UAT | PASS | Terrain, object, environment, rules, input, collision, and render validate together. |
+| Samples | SKIP | Permanently out of scope. |
+| Tools | SKIP | Out of scope. |
+
+## Remaining Engine Blockers
+
+No blocker remains for the current headless manifest-driven runtime lane.
+
+Future engine work can extend:
+
+- richer render target integration
+- richer asset binding
+- fuller rule execution
+- broader collision shape support
+- browser-facing runtime harness
+
+## Next Lane
+
+Next lane: browser-facing manifest runtime harness.
+
+Expected first slice:
+
+- mount the headless manifest-driven runtime into a browser render target
+- keep manifest config as the only scene source
+- preserve visible error reporting
+- keep samples out of scope until explicitly requested
+
+## Lanes Executed
+
+- engine - runtime closeout validation.
+- runtime - manifest-driven playable runtime validation.
+
+## Lanes Skipped
+
+- samples - permanently out of scope.
+- tools - out of scope.
+- recovery/UAT outside engine runtime - out of scope.
+
+## Playwright
+
+Playwright impacted: No browser/tool UI impact in this closeout. The runtime lane remains validated through targeted Node tests.
+
+## Manual Validation
+
+Review the closeout tests and reports to confirm the runtime lane is manifest-driven only and no sample or tool paths are used.
+
+## Blocker Scope
+
+No blocker for the manifest-driven engine runtime lane closeout.

docs/dev/reports/runtime_error_reporting.md

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+# Runtime Error Reporting
+
+PR: PR_26152_199-runtime-error-reporting
+Date: 2026-06-02
+
+## Scope
+
+- Added visible runtime error reporting for manifest, object, terrain, environment, rule, input, collision, and render failures.
+- Error reports require explicit stage, source, and error items.
+- No silent fallback or hidden defaults were added.
+
+## Validation
+
+Command:
+
+```powershell
+node tests/engine/RuntimeErrorReporting.test.mjs
+```
+
+Result: PASS.
+
+## Lanes Executed
+
+- engine - runtime error reporting validation.
+- runtime - visible error report data only.
+
+## Lanes Skipped
+
+- samples - permanently out of scope.
+- tools - out of scope.
+- browser Playwright - not part of this headless engine validation.
+
+## Playwright
+
+Playwright impacted: No browser/tool UI impact. This PR validates headless engine error report data through targeted Node tests.
+
+## Manual Validation
+
+Review `RuntimeErrorReporting.test.mjs` and confirm every approved failure stage creates a visible report and invalid report inputs fail visibly.
+
+## Blocker Scope
+
+No blocker for runtime error reporting.

docs/dev/reports/runtime_manifest_fixture_hardening.md

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+# Runtime Manifest Fixture Hardening
+
+PR: PR_26152_201-runtime-manifest-fixture-hardening
+Date: 2026-06-02
+
+## Scope
+
+- Hardened manifest-driven runtime fixtures.
+- Added valid engine fixture helper.
+- Added invalid engine fixture scenarios for manifest, object, terrain, environment, rule, and input failures.
+- No samples or tool fixtures were added.
+
+## Validation
+
+Command:
+
+```powershell
+node tests/engine/RuntimeManifestFixtureHardening.test.mjs
+```
+
+Result: PASS.
+
+## Lanes Executed
+
+- engine - manifest-driven engine fixture validation.
+- runtime - valid and invalid fixture coverage only.
+
+## Lanes Skipped
+
+- samples - permanently out of scope.
+- tools - out of scope.
+- browser Playwright - not part of this headless engine validation.
+
+## Playwright
+
+Playwright impacted: No browser/tool UI impact. This PR validates fixture behavior through targeted Node tests.
+
+## Manual Validation
+
+Review `RuntimeManifestDrivenFixture.mjs` and confirm fixture exports are engine-only and contain no sample or tool fixture assumptions.
+
+## Blocker Scope
+
+No blocker for runtime manifest fixture hardening.

docs/dev/reports/runtime_playable_scene_uat.md

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+# Runtime Playable Scene UAT
+
+PR: PR_26152_202-runtime-playable-scene-uat
+Date: 2026-06-02
+
+## Scope
+
+- Added UAT validation for the first manifest-driven playable scene.
+- Validated terrain, object, environment, rules, input, collision, and render work together.
+- No sample dependency was added.
+
+## Validation
+
+Command:
+
+```powershell
+node tests/engine/RuntimePlayableSceneUat.test.mjs
+```
+
+Result: PASS.
+
+## Lanes Executed
+
+- engine - first playable scene UAT validation.
+- runtime - integrated headless runtime behavior only.
+
+## Lanes Skipped
+
+- samples - permanently out of scope.
+- tools - out of scope.
+- browser Playwright - not part of this headless engine validation.
+
+## Playwright
+
+Playwright impacted: No browser/tool UI impact. This PR validates the headless playable scene through targeted Node tests.
+
+## Manual Validation
+
+Review `RuntimePlayableSceneUat.test.mjs` and confirm the scene exercises terrain, object, environment, rules, input, collision, and render together.
+
+## Blocker Scope
+
+No blocker for runtime playable scene UAT.