Phase 18 validation sweep

Author: DavidQ

docs/dev/CODEX_COMMANDS.md

@@ -1,3 +1,3 @@
 MODEL: GPT-5.3-codex
 REASONING: high
-COMMAND: Integrate Phase 18 services and runtime layer, validate flow, package to <project folder>/tmp/BUILD_PR_LEVEL_18_5_PHASE18_INTEGRATION_PASS.zip
+COMMAND: Validate Phase 18 build and ensure stability, package to <project folder>/tmp/BUILD_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP.zip

docs/dev/COMMIT_COMMENT.txt

@@ -1 +1 @@
-Phase 18 integration pass
+Phase 18 validation sweep

docs/dev/reports/BUILD_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP_report.md

@@ -0,0 +1,27 @@
+# BUILD_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP Report
+
+Date: 2026-04-16
+
+## Scope
+- Validate Phase 18 service/runtime/integration flow stability.
+- No feature expansion.
+
+## Executed Checks
+1. `Phase18CoreServicesSkeleton`
+   - Result: PASS
+2. `Phase18RuntimeLayerScaffold`
+   - Result: PASS
+3. `Phase18IntegrationFlowPass`
+   - Result: PASS
+4. Phase 18 launcher wiring/path validation
+   - `samples/index.html` contains `./phase-18/1801/index.html`
+   - `samples/phase-18/1801/index.html` exists
+   - `samples/phase-18/1801/main.js` exists
+   - `samples/phase-18/1801/Phase18FoundationScene.js` exists
+   - Result: PASS
+5. Phase 18 sample render lifecycle probe (`enter -> update -> render -> exit`)
+   - Result: PASS
+
+## Stability Conclusion
+- Phase 18 core services, runtime layer, and integration flow are stable for current scaffold scope.
+- No regressions detected by targeted validation sweep.

docs/dev/reports/validation_checklist.txt

@@ -1,2 +1,2 @@
-- [ ] integration works
-- [ ] no errors
+- [ ] all systems stable
+- [ ] no regressions

docs/pr/BUILD_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP.md

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+# BUILD_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP
+
+## Purpose
+Validate Phase 18 service/runtime/integration flow stability without expanding feature scope.
+
+## Source of Truth
+- `docs/pr/PLAN_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP.md`
+- `docs/pr/BUILD_PR_LEVEL_18_3_PHASE18_CORE_SERVICES.md`
+- `docs/pr/BUILD_PR_LEVEL_18_4_PHASE18_RUNTIME_LAYER.md`
+- `docs/pr/BUILD_PR_LEVEL_18_5_PHASE18_INTEGRATION_PASS.md`
+
+## Exact Build Target
+1. Execute targeted Phase 18 validation checks:
+   - core service lifecycle/communication test
+   - runtime-layer scheduler/state test
+   - integration-flow end-to-end test
+   - sample `1801` launcher/path presence check
+2. Confirm no regressions in the Phase 18 scaffolding surface.
+3. Write a compact validation report under `docs/dev/reports/`.
+
+## Non-Goals
+- no new Phase 18 feature implementation
+- no engine-core changes
+- no roadmap status updates
+
+## Validation
+- `Phase18CoreServicesSkeleton` passes
+- `Phase18RuntimeLayerScaffold` passes
+- `Phase18IntegrationFlowPass` passes
+- `samples/index.html` contains `./phase-18/1801/index.html` and sample files exist
+
+## Packaging Rule
+Package only this PR's created/modified files into:
+`tmp/BUILD_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP.zip`

docs/pr/BUILD_PR_LEVEL_18_7_PHASE18_COMPLETION_GATE.md

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+# BUILD_PR_LEVEL_18_7_PHASE18_COMPLETION_GATE
+
+Implement:
+- final validation
+- roadmap status update only

docs/pr/PLAN_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP.md

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+# PLAN_PR_LEVEL_18_6_PHASE18_VALIDATION_SWEEP
+
+Purpose:
+Validate Phase 18 functionality.

docs/pr/PLAN_PR_LEVEL_18_7_PHASE18_COMPLETION_GATE.md

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+# PLAN_PR_LEVEL_18_7_PHASE18_COMPLETION_GATE
+
+Purpose:
+Finalize Phase 18 and confirm readiness for next phase.