Run engine/runtime validation sweep

- validated samples, runtime, and engine boundaries
- identified integration gaps and failures
- produced validation reports

Advances:
- validation sweep [ ] -> [x]

Author: DavidQ

docs/dev/reports/BUILD_PR_LEVEL_23_1_ENGINE_RUNTIME_VALIDATION_SWEEP_FAILURES.md

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+# BUILD_PR_LEVEL_23_1_ENGINE_RUNTIME_VALIDATION_SWEEP — Failures
+
+## Failure Inventory
+
+### F-001
+- Command: `node tools/dev/checkSharedExtractionGuard.mjs`
+- Status: FAIL
+- Error Summary:
+  - `Shared extraction guard failed with 2 unexpected violation(s).`
+  - `TYPE: inline-helper-clone`
+  - `MATCH: rule:number-is-finite-usage`
+- Affected Files:
+  - `samples/phase-17/shared/voxelTileRenderPipeline.js`
+  - `src/engine/runtime/RuntimeMonitoringHooks.js`
+- Metrics:
+  - `files_scanned=1330`
+  - `total_violations=632`
+  - `baseline_expected=614`
+  - `baseline_unexpected=2`
+  - `baseline_resolved=1`
+
+## Non-Failures (for context)
+- `node ./tests/runtime/LaunchSmokeAllEntries.test.mjs --samples`: PASS (`242/242`)
+- level23 core contract suite: PASS
+
+## Current Blocking Status
+- Blocking for strict shared-extraction guard compliance.
+- Not blocking for sample/runtime launch health in this validation sweep.

docs/dev/reports/BUILD_PR_LEVEL_23_1_ENGINE_RUNTIME_VALIDATION_SWEEP_INTEGRATION_GAPS.md

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+# BUILD_PR_LEVEL_23_1_ENGINE_RUNTIME_VALIDATION_SWEEP — Integration Gaps
+
+## Gap 1: Shared Extraction Guard Baseline Drift
+- Category: contract drift
+- Surface: shared extraction enforcement across samples/runtime
+- Failing command: `node tools/dev/checkSharedExtractionGuard.mjs`
+- Observed:
+  - `baseline_unexpected=2`
+  - `rule:number-is-finite-usage`
+  - impacted files:
+    - `samples/phase-17/shared/voxelTileRenderPipeline.js`
+    - `src/engine/runtime/RuntimeMonitoringHooks.js`
+
+### Impact
+- Runtime/sample behavior is currently stable (all targeted runtime/sample validations pass), but guard enforcement indicates extraction-contract drift.
+- CI/pretest lanes that require guard baseline parity can fail until this drift is reconciled.
+
+### Suggested Resolution Path
+1. Confirm whether the two new usages are valid shared-layer patterns.
+2. If valid, update guard baseline expectations with execution-backed evidence.
+3. If invalid, refactor to existing shared extraction surfaces and rerun guard.
+
+## Gap 2: None detected for sample execution lane
+- Sample launch smoke covered 242 entries and found no runtime launch failures.
+- No broken sample integration issues were detected in this sweep.
+
+## Gap 3: None detected for engine boundary lane
+- `EnginePublicBarrelImports` and `ToolBoundaryEnforcement` passed in this sweep.
+- No immediate engine boundary regressions detected.

docs/dev/reports/BUILD_PR_LEVEL_23_1_ENGINE_RUNTIME_VALIDATION_SWEEP_VALIDATION_REPORT.md

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+# BUILD_PR_LEVEL_23_1_ENGINE_RUNTIME_VALIDATION_SWEEP — Validation Report
+
+## Scope Executed
+- samples validation
+- runtime validation
+- engine boundary validation
+
+## Commands Run
+1. `node --input-type=module -e "import { run as s } from './tests/samples/SamplesProgramCombinedPass.test.mjs'; import { run as r } from './tests/runtime/Phase19RuntimeLifecycleValidation.test.mjs'; import { run as e } from './tests/production/EnginePublicBarrelImports.test.mjs'; import { run as b } from './tests/tools/ToolBoundaryEnforcement.test.mjs'; s(); r(); e(); b(); console.log('PASS level23 validation core suite');"`
+2. `node ./tests/runtime/LaunchSmokeAllEntries.test.mjs --samples`
+3. `node tools/dev/checkSharedExtractionGuard.mjs`
+
+## Results Summary
+- Core suite: **PASS**
+  - `SamplesProgramCombinedPass`: PASS
+  - `Phase19RuntimeLifecycleValidation`: PASS
+  - `EnginePublicBarrelImports`: PASS
+  - `ToolBoundaryEnforcement`: PASS
+- Sample launch smoke (`--samples`): **PASS**
+  - `PASS=242 FAIL=0 TOTAL=242`
+- Shared extraction guard: **FAIL**
+  - `baseline_unexpected=2`
+
+## Validation Outcome
+- Validation sweep execution completed across requested surfaces.
+- No broken samples were detected in runtime smoke or sample contract checks.
+- One contract-drift failure remains in shared extraction guard baseline compliance.
+
+## Evidence Artifacts
+- `docs/dev/reports/launch_smoke_report.md`
+- guard output from `tools/dev/checkSharedExtractionGuard.mjs` (captured in failures report)