Advance deduplicated paint capability coverage

docs/tasks/WBV2-P16-000.md

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+# WBV2-P16-000: paint capability continuation root
+
+- task: WBV2-P16-000
+- parent: WBV2-P15-003
+- status: done
+- gap: workflow:authorize_paint_capability_continuation
+- ownerFamily: PROGRAM
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Authorize a source-backed Sculpt/Paint continuation. P16 reuses the 6900-entry coverage ledger and validates one vertex-color/weight behavior batch against the compiled WebEngine WASM Main in Chromium.
+
+## 验收
+
+- `node tools/web/generate-wbv2-paint-root.mjs`
+- `node tools/web/check-execution-control-plane.mjs`
+- `node tools/web/check-v2-task-index.mjs`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P16-000/`
+- Manifest: `tests/golden/WBV2-P16-000/manifest.json`
+- Rollback: restore P15-003 as queue parent without rewriting P15 evidence.