Add deterministic lane snapshots and execution-graph reuse to reduce repeated targeted-lane rebuild and dependency traversal overhead - PR_26146_037-deterministic-lane-snapshots-and-graph-reuse

Author: ToolboxAid

docs/dev/reports/dependency_gating_report.md

@@ -1,6 +1,6 @@
 # Dependency Gating Report
 
-Generated: 2026-05-26T20:35:58.938Z
+Generated: 2026-05-26T20:47:41.392Z
 Status: PASS
 
 ## Gate Order

docs/dev/reports/dependency_hydration_reuse_report.md

@@ -1,6 +1,6 @@
 # Dependency Hydration Reuse Report
 
-Generated: 2026-05-26T20:35:58.939Z
+Generated: 2026-05-26T20:47:41.393Z
 Status: PASS
 
 ## Summary

docs/dev/reports/execution_graph_reuse_report.md

@@ -0,0 +1,35 @@
+# Execution Graph Reuse Report
+
+Generated: 2026-05-26T20:47:41.393Z
+Status: PASS
+
+## Summary
+
+Reused execution graphs: 4
+Prevented graph rebuilds: 4
+Prevented redundant dependency traversal: 4
+Prevented fixture/helper graph assembly: 17
+Prevented manifest traversal: 4
+Prevented targeted scheduling work: 4
+
+## Execution Graph Decisions
+
+| Lane | Status | Snapshot Status | Execution Graph Hash | Reason |
+| --- | --- | --- | --- | --- |
+| tool-runtime | REUSED | REUSED | efa4203683589f08 | Lane snapshot is part of the selected targeted execution graph. |
+| game-runtime | REUSED | REUSED | 9bc2253407c5b3be | Lane snapshot is part of the selected targeted execution graph. |
+| integration | REUSED | REUSED | c6571bb72b5f91c9 | Lane snapshot is part of the selected targeted execution graph. |
+| engine-src | REUSED | REUSED | ec4e15969f9cbbcb | Lane snapshot is part of the selected targeted execution graph. |
+
+## Safeguards
+
+- Execution graph reuse is allowed only when the lane snapshot hash remains valid.
+- Stale graph snapshots are invalidated before runtime scheduling.
+- Deterministic invalidation does not fall back to broad lane regeneration.
+- Reused execution graphs keep targeted lane scope and do not start Workspace/global lanes unless selected.
+
+## Runtime Savings Observations
+
+- Reused snapshots reduce repeated lane graph construction.
+- Reused snapshots reduce repeated manifest, helper, fixture, and dependency traversal.
+- Reused snapshots reduce repeated targeted scheduling work before Playwright/browser startup.

docs/dev/reports/failure_fingerprint_report.md

@@ -1,6 +1,6 @@
 # Failure Fingerprint Report
 
-Generated: 2026-05-26T20:38:01.099Z
+Generated: 2026-05-26T20:49:40.108Z
 Status: WARN
 
 ## Summary

docs/dev/reports/filesystem_scan_reduction_report.md

@@ -1,6 +1,6 @@
 # Filesystem Scan Reduction Report
 
-Generated: 2026-05-26T20:35:58.913Z
+Generated: 2026-05-26T20:47:41.366Z
 Status: PASS
 
 ## Scan Enforcement

docs/dev/reports/incremental_validation_report.md

@@ -1,6 +1,6 @@
 # Incremental Validation Report
 
-Generated: 2026-05-26T20:35:58.941Z
+Generated: 2026-05-26T20:47:41.394Z
 Status: PASS
 
 ## Reuse Summary

docs/dev/reports/lane_compilation_report.md

@@ -1,6 +1,6 @@
 # Lane Compilation Report
 
-Generated: 2026-05-26T20:35:58.938Z
+Generated: 2026-05-26T20:47:41.391Z
 Status: PASS
 
 ## Lane Graph

docs/dev/reports/lane_deduplication_report.md

@@ -1,6 +1,6 @@
 # Lane Deduplication Report
 
-Generated: 2026-05-26T20:35:58.938Z
+Generated: 2026-05-26T20:47:41.392Z
 Status: PASS
 
 ## Summary

docs/dev/reports/lane_input_validation_report.md

@@ -1,6 +1,6 @@
 # Lane Input Validation Report
 
-Generated: 2026-05-26T20:35:58.941Z
+Generated: 2026-05-26T20:47:41.394Z
 Status: PASS
 
 ## Input Files

docs/dev/reports/lane_runtime_optimization_report.md

@@ -1,13 +1,15 @@
 # Lane Runtime Optimization Report
 
-Generated: 2026-05-26T20:35:58.939Z
+Generated: 2026-05-26T20:47:41.392Z
 Status: PASS
 
 ## Runtime Cost Summary
 
 Reused runtime sessions: 3
+Reused lane snapshots: 4
 Reused warm-start lanes: 4
 Reused dependency hydration: 4
+Prevented graph rebuilds: 4
 Prevented redundant initialization: 4
 Prevented redundant browser launches: 4
 Prevented redundant lane execution: 2
@@ -27,16 +29,17 @@ No zero-browser, compilation, or dependency blockers were found.
 
 ## Lane Plans
 
-| Lane | Warm Start | Hydration | Baseline Browser Launches | Scheduled Browser Launches | Commands | Reason |
-| --- | --- | --- | --- | --- | --- | --- |
-| tool-runtime | REUSED | REUSED | 3 | 2 | C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/tools/AssetManagerV2.spec.mjs --grep "launch guard|temporary UAT context|rejects non-Workspace" --project=playwright --workers=1 --reporter=list; C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/tools/PreviewGeneratorV2Baseline.spec.mjs tests/playwright/tools/CollisionInspectorV2.spec.mjs --project=playwright --workers=1 --reporter=list | Tool runtime lane validates focused tool behavior without treating unrelated stale product assertions as blockers. |
-| game-runtime | REUSED | REUSED | 4 | 1 | C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/games/AsteroidsBackgroundAssetResolution.spec.mjs tests/playwright/games/AsteroidsBeatTiming.spec.mjs tests/playwright/games/AsteroidsGameSceneCleanup.spec.mjs tests/playwright/games/AsteroidsShipStateVisuals.spec.mjs --project=playwright --workers=1 --reporter=list | Game runtime lane validates explicit game-owned Playwright behavior only. |
-| integration | REUSED | REUSED | 1 | 1 | C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/integration/GameIndexPreviewManifestResolution.spec.mjs --grep Pong --project=playwright --workers=1 --reporter=list | Integration lane validates explicit cross-surface handoffs only; broad all-game thumbnail coverage is outside the default targeted lane. |
-| engine-src | REUSED | REUSED | 0 | 0 | C:\nvm4w\nodejs\node.exe scripts/run-node-test-files.mjs tests/core/EngineCoreBoundaryBaseline.test.mjs tests/core/FrameClock.test.mjs tests/core/FixedTicker.test.mjs tests/assets/AssetLoaderSystem.test.mjs tests/audio/AudioService.test.mjs tests/input/InputMap.test.mjs tests/input/KeyboardState.test.mjs tests/input/MouseState.test.mjs tests/input/GamepadInputAdapter.test.mjs tests/input/GamepadHapticsService.test.mjs tests/render/Renderer.test.mjs | Engine/src lane validates reusable runtime surfaces through targeted node tests. |
+| Lane | Snapshot | Warm Start | Hydration | Baseline Browser Launches | Scheduled Browser Launches | Commands | Reason |
+| --- | --- | --- | --- | --- | --- | --- | --- |
+| tool-runtime | REUSED | REUSED | REUSED | 3 | 2 | C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/tools/AssetManagerV2.spec.mjs --grep "launch guard|temporary UAT context|rejects non-Workspace" --project=playwright --workers=1 --reporter=list; C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/tools/PreviewGeneratorV2Baseline.spec.mjs tests/playwright/tools/CollisionInspectorV2.spec.mjs --project=playwright --workers=1 --reporter=list | Tool runtime lane validates focused tool behavior without treating unrelated stale product assertions as blockers. |
+| game-runtime | REUSED | REUSED | REUSED | 4 | 1 | C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/games/AsteroidsBackgroundAssetResolution.spec.mjs tests/playwright/games/AsteroidsBeatTiming.spec.mjs tests/playwright/games/AsteroidsGameSceneCleanup.spec.mjs tests/playwright/games/AsteroidsShipStateVisuals.spec.mjs --project=playwright --workers=1 --reporter=list | Game runtime lane validates explicit game-owned Playwright behavior only. |
+| integration | REUSED | REUSED | REUSED | 1 | 1 | C:\nvm4w\nodejs\node.exe C:\Users\davidq\Documents\GitHub\HTML-JavaScript-Gaming\node_modules\@playwright\test\cli.js test tests/playwright/integration/GameIndexPreviewManifestResolution.spec.mjs --grep Pong --project=playwright --workers=1 --reporter=list | Integration lane validates explicit cross-surface handoffs only; broad all-game thumbnail coverage is outside the default targeted lane. |
+| engine-src | REUSED | REUSED | REUSED | 0 | 0 | C:\nvm4w\nodejs\node.exe scripts/run-node-test-files.mjs tests/core/EngineCoreBoundaryBaseline.test.mjs tests/core/FrameClock.test.mjs tests/core/FixedTicker.test.mjs tests/assets/AssetLoaderSystem.test.mjs tests/audio/AudioService.test.mjs tests/input/InputMap.test.mjs tests/input/KeyboardState.test.mjs tests/input/MouseState.test.mjs tests/input/GamepadInputAdapter.test.mjs tests/input/GamepadHapticsService.test.mjs tests/render/Renderer.test.mjs | Engine/src lane validates reusable runtime surfaces through targeted node tests. |
 
 ## Runtime Savings Observations
 
 - Zero-browser preflight, lane compilation, and dependency validation run once per targeted runner invocation.
+- Reused lane snapshots avoid rebuilding identical targeted execution graphs.
 - Validated warm-start lanes reuse deterministic initialization state when manifest and dependency hashes are unchanged.
 - Reused dependency hydration avoids repeated helper resolution and fixture ownership traversal for compatible targeted runs.
 - Compatible Playwright specs with matching options are kept in shared CLI invocations to avoid redundant browser startup.