Add baseline performance measurement for V2 tools (load, session, render timing) - PR 11.220

Author: DavidQ

docs/dev/reports/PR_11_220_report.md

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+# PR_11_220 Report - V2 Performance Baseline (Load + Render Timing)
+
+## Files Changed
+- `tests/runtime/V2Performance.test.mjs`
+- `docs/dev/reports/PR_11_220_report.md`
+
+## Measurement Scope
+Baseline-only runtime measurement (no optimization pass) for:
+- `asset-browser-v2`
+- `palette-manager-v2`
+- `svg-asset-studio-v2`
+- `tilemap-studio-v2`
+- `vector-map-editor-v2`
+
+Captured per tool:
+1. load start -> script ready
+2. session read -> session resolved
+3. render start -> render complete (`VALID` path simulation)
+
+Output artifact:
+- `tmp/v2-performance-results.json`
+
+## Validation Commands Run
+1. `node --check tests/runtime/V2Performance.test.mjs`  
+Result: **PASS**
+2. `node tests/runtime/V2Performance.test.mjs`  
+Result: **PASS**
+3. `node --check tools/*-v2/index.js`  
+Result: **FAIL** on Windows/Node wildcard resolution (`MODULE_NOT_FOUND` for literal `tools\\*-v2\\index.js`)
+4. Explicit equivalent per-file syntax sweep for `tools/*-v2/index.js`  
+Result: **PASS** for all detected V2 tool JS files
+
+## Timing Results Per Tool (ms)
+- `asset-browser-v2`: load `0.190`, session `0.183`, render `0.077`, total `0.576`
+- `palette-manager-v2`: load `0.095`, session `0.207`, render `0.079`, total `0.398`
+- `svg-asset-studio-v2`: load `0.109`, session `0.133`, render `0.080`, total `0.334`
+- `tilemap-studio-v2`: load `0.103`, session `0.133`, render `0.058`, total `0.309`
+- `vector-map-editor-v2`: load `0.130`, session `0.245`, render `0.141`, total `0.530`
+
+## Average Timings (ms)
+- load start -> script ready: `0.125`
+- session resolve: `0.180`
+- render (`VALID`) time: `0.087`
+- total: `0.429`
+
+## Outliers
+- No outliers flagged by the harness threshold (`total > 1.5x average total`).
+
+## Behavior Change Confirmation
+- No V2 tool rendering logic was changed.
+- No schema/sample/game/workspace-v1/platformShell/tools/shared files were changed.
+- No fallback/default/demo data was introduced.
+- This PR adds measurement-only runtime coverage and reporting.