Advance WBV2 domain parity through P12

docs/tasks/WBV2-P12-004.md

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+# WBV2-P12-004: viewport and non-mesh engine receipt
+
+- task: WBV2-P12-004
+- parent: WBV2-P12-003
+- status: in_progress
+- gap: workflow:viewport_nonmesh_engine_receipt
+- ownerFamily: VIEWPORT
+- targetImplementationClass: LOCAL_BOUNDED
+
+## 目标
+
+Bind viewport SceneIR and bounded non-mesh read/edit paths to the compiled WebEngine runtime with explicit unsupported boundaries.
+
+## 输入与范围
+
+- Viewport report: `tests/golden/WBV2-P2-004/viewport-report.json`
+- Non-mesh report: `tests/golden/WBV2-P4-003/sculpt-report.json`
+- WebEngine client: `web/app/src/engine-client/WebEngineClient.ts`
+
+## 验收
+
+- `npm --prefix web run test:e2e -- --workers=1 tests/e2e/wbv2-viewport-nonmesh-production.spec.ts`
+- `node tools/web/generate-wbv2-viewport-nonmesh-receipt.mjs --write`
+- `node tools/web/check-task-context.mjs --task WBV2-P12-004 --write`
+
+Unsupported data, malformed geometry, budget overflow, device loss, 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-P12-004/`
+- Status: `docs/status/WBV2-P12-004.md`
+- Manifest: `tests/golden/WBV2-P12-004/manifest.json`
+- Rollback: restore P12-003 as queue parent.