Advance WBV2 domain parity through P12

docs/tasks/WBV2-P12-003.md

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+# WBV2-P12-003: material and animation engine receipt
+
+- task: WBV2-P12-003
+- parent: WBV2-P12-002
+- status: in_progress
+- gap: workflow:material_animation_engine_receipt
+- ownerFamily: AUTHORING
+- targetImplementationClass: LOCAL_EXACT
+
+## 目标
+
+Bind material Principled/texture and TRS keyframe edits to the compiled WebEngine WASM Main.
+
+## 输入与范围
+
+- Material fixture: `tests/files/web/generated/WBV2-P3-001-MATERIAL.PBR_UV.blend`
+- Animation fixture: `tests/files/web/generated/WBV2-P3-002-ANIMATION.TRS_ACTION.blend`
+- Existing reports: `tests/golden/WBV2-P3-001/material-report.json`, `tests/golden/WBV2-P3-002/animation-report.json`
+
+## 验收
+
+- `npm --prefix web run test:e2e -- --workers=1 tests/e2e/wbv2-material-animation-production.spec.ts`
+- `node tools/web/generate-wbv2-material-animation-receipt.mjs --write`
+- `node tools/web/check-task-context.mjs --task WBV2-P12-003 --write`
+
+Malformed graph, unsupported node, stale frame, missing image, non-Chromium, or non-exact save/reopen cases must keep in_progress and must not advance nextTask.
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P12-003/`
+- Status: `docs/status/WBV2-P12-003.md`
+- Manifest: `tests/golden/WBV2-P12-003/manifest.json`
+- Rollback: restore P12-002 as queue parent.