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.

docs/tasks/WBV2-P16-001.md

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+# WBV2-P16-001: select_paint_capability_batch
+
+- task: WBV2-P16-001
+- parent: WBV2-P16-000
+- status: in_progress
+- gap: capability:SCULPT.PAINT_ATTRIBUTES
+- ownerFamily: PARITY
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Select one deterministic vertex-color and weight-paint behavior batch from source and inventory evidence.
+
+## 输入与范围
+
+- Focused source: `tests/golden/WBV2-P0-002/parity-map.json`
+- Existing source receipt: `tests/golden/WBV2-P4-003/sculpt-report.json`
+- Production API: `blender-5.2.0/source/blender/web_engine/web_engine_api.cpp`
+- Production entrypoint: `node tools/web/generate-wbv2-paint-selection.mjs --write`
+
+## 验收
+
+- source commands are present and hash-bound
+- existing paint evidence is reused read-only
+- candidate remains representative rather than full-family completion
+- malformed, hash-drift, unsupported, or false-completion input keeps in_progress
+- `node tools/web/check-task-context.mjs --task WBV2-P16-001 --write`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P16-001/`
+- Status: `docs/status/WBV2-P16-001.md`
+- Manifest: `tests/golden/WBV2-P16-001/manifest.json`
+- Rollback: restore P16-000 as queue parent.

docs/tasks/WBV2-P16-002.md

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+# WBV2-P16-002: paint_attributes_engine_receipt
+
+- task: WBV2-P16-002
+- parent: WBV2-P16-001
+- status: in_progress
+- gap: capability:SCULPT.PAINT_ATTRIBUTES
+- ownerFamily: SCULPT
+- targetImplementationClass: LOCAL_EXACT
+
+## 目标
+
+Bind vertex colors and weights, undo/redo, malformed rejection, and exact save/reopen to compiled WASM Main in Chromium.
+
+## 输入与范围
+
+- Focused source: `tests/golden/WBV2-P16-001/paint-selection-report.json`
+- Production test: `web/tests/e2e/wbv2-paint-attributes-production.spec.ts`
+- Production entrypoint: `npm --prefix web run test:e2e -- --workers=1 tests/e2e/wbv2-paint-attributes-production.spec.ts`
+
+## 验收
+
+- vertex colors and weights match bounded expectations
+- undo/redo revisions are sequential
+- malformed input fails closed without Main mutation
+- save/reopen is exact and deterministic
+- Chromium is the only browser
+- `node tools/web/check-task-context.mjs --task WBV2-P16-002 --write`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P16-002/`
+- Status: `docs/status/WBV2-P16-002.md`
+- Manifest: `tests/golden/WBV2-P16-002/manifest.json`
+- Rollback: restore P16-001 as queue parent.

docs/tasks/WBV2-P16-003.md

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+# WBV2-P16-003: close_paint_capability_gate
+
+- task: WBV2-P16-003
+- parent: WBV2-P16-002
+- status: in_progress
+- gap: workflow:close_paint_capability_gate
+- ownerFamily: RELEASE
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Close the paint capability gate without promoting representative evidence to full-family completion.
+
+## 输入与范围
+
+- Focused receipt: `tests/golden/WBV2-P16-002/paint-attributes-receipt-report.json`
+- Coverage matrix: `tests/golden/WBV2-P14-002/capability-evidence-matrix.json`
+- Production entrypoint: `node tools/web/generate-wbv2-paint-gate.mjs --write`
+
+## 验收
+
+- only tested paint behavior is claimed
+- base inventory remains 6618; exact completion overlay reduces effective pending to 6616
+- duplicate validation remains zero
+- malformed, hash-drift, unsupported, or false-completion input keeps in_progress
+- historical reproduction remains false
+- `node tools/web/check-task-context.mjs --task WBV2-P16-003 --write`
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P16-003/`
+- Status: `docs/status/WBV2-P16-003.md`
+- Manifest: `tests/golden/WBV2-P16-003/manifest.json`
+- Rollback: restore P16-002 as queue parent.