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Engine/tool boundary leak validation (Phase 19 final lane)
BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION
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‎docs/dev/CODEX_COMMANDS.md‎

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MODEL: GPT-5.3-codex
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REASONING: high
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Execute BUILD_PR_LEVEL_19_22_TOOLCHAIN_VALIDATION_SUMMARY_GATE:
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- aggregate all Phase 19 validation reports
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- produce final summary
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- output to docs/dev/reports
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- do not modify engine or tools
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Execute BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION:
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- inspect src/engine
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- detect any tool-specific references or dependencies
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- validate boundary rules
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- output findings to docs/dev/reports
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- do not modify code

‎docs/dev/COMMIT_COMMENT.txt‎

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Phase 19 validation summary gate
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Engine/tool boundary leak validation (Phase 19 final lane)
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BUILD_PR_LEVEL_19_22_TOOLCHAIN_VALIDATION_SUMMARY_GATE
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BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION

‎docs/dev/reports/BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION_report.md‎

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# BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION Report
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Date: 2026-04-17
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Scope: Validation-only scan of `src/engine` for tool-specific references/dependencies.
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## Boundary Rules Checked
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- Engine layer should contain reusable runtime logic only.
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- Tool/editor/pipeline logic should remain in tools-layer boundaries.
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- Dependency direction must not introduce engine dependency on tool-specific surfaces.
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## Method
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Command run (targeted scan only):
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- Python scan over `src/engine` JS/TS files to detect:
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- import/require references to `tools/`
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- local imports into `./editor`, `./tooling`, `./pipeline`
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- tool/editor/pipeline keyword evidence
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- inventory of tool-like folders under `src/engine`
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## Findings
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- Files scanned in `src/engine`: **292**
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- Direct imports from `src/engine` to `tools/`: **0**
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- Local imports to `./editor` / `./tooling` / `./pipeline`: **0**
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- Tool/editor/pipeline keyword hits: **13** (includes naming/comments and known debug naming)
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### Tool-Specific Surfaces Found Inside Engine Layer
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- `src/engine/editor` (5 files)
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- `EntityPlacementEditor.js`
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- `LevelEditor.js`
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- `TileMapEditor.js`
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- `TimelineEditor.js`
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- `index.js`
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- `src/engine/tooling` (8 files)
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- `AssetBrowser.js`
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- `CapturePreviewRuntime.js`
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- `DeveloperConsole.js`
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- `LiveTuningService.js`
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- `PropertyEditor.js`
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- `RuntimeInspector.js`
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- `SceneGraphViewer.js`
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- `index.js`
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- `src/engine/pipeline` (7 files)
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- `AssetImportPipeline.js`
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- `AudioPreprocessPipeline.js`
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- `BuildAssetManifestSystem.js`
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- `ContentMigrationSystem.js`
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- `ContentValidationPipeline.js`
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- `TexturePreprocessPipeline.js`
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- `index.js`
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## Validation Verdict
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- Boundary rule "no engine dependency on tools package": **PASS**
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- Boundary rule "zero tool-specific logic inside engine layer": **FAIL**
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Reason: tool/editor/pipeline modules are present under `src/engine/*`, which violates strict tool-vs-engine separation even without explicit `tools/` import dependencies.
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## Bounded Caveat
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This PR performs validation only and intentionally makes no code changes.

‎docs/dev/reports/change_summary.txt‎

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Docs-only aggregation PR for Phase 19 validation
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Docs-only PR to validate no tool logic leaks into engine

‎docs/dev/reports/file_tree.txt‎

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docs/pr/BUILD_PR_LEVEL_19_22_TOOLCHAIN_VALIDATION_SUMMARY_GATE.md
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docs/pr/BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION.md
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docs/dev/codex_commands.md
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docs/dev/commit_comment.txt
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docs/dev/reports/*

‎docs/dev/reports/validation_checklist.txt‎

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[ ] All Phase 19 reports aggregated
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[ ] No implementation created
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[ ] Summary report generated
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[ ] No tool imports in engine
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[ ] No tool assumptions in engine
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[ ] Boundary rules enforced
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[ ] Report generated

‎docs/pr/BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION.md‎

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# BUILD_PR_LEVEL_19_23_ENGINE_TOOL_BOUNDARY_LEAK_VALIDATION
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## Purpose
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Confirm no tool-specific logic leaks into engine.
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## Scope
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- validation only
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- docs-only PR
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- no implementation authored here
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## Codex Responsibilities
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- scan engine for tool-specific imports, assumptions, or logic
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- validate strict separation (tools -> engine is forbidden)
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- report any violations
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## Acceptance
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- zero tool-specific logic inside engine layer
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- validation report produced

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