chore: checkpoint web Blender feature-gap work, docs and tests

- update native web_engine sources and rebuilt wasm artifacts
- add task cards, status notes and tooling scripts
- add web e2e specs, tutorial UI sources and tutorial assets
- sync golden task manifests and audit records

Co-Authored-By: Claude Code <noreply@anthropic.com>

docs/tasks/WBV2-P1424-900.md

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+# WBV2-P1424-900: supersede stalled task for domain parity
+
+- task: WBV2-P1424-900
+- parent: WBV2-P1424-001
+- status: done
+- ownerFamily: PROGRAM
+- targetImplementationClass: QUEUE_ONLY
+
+## 目标
+
+记录用户 2026-11-10 授权的队列桥接：保留 `WBV2-P1424-001` 的 manifest、continuation、`in_progress` 状态和全部未闭合证据，不修改该文件；由本桥接指向三域全量对标 epoch 根任务 `WBV2-P1425-000`。
+
+## 输入与范围
+
+- 保留任务：`tests/golden/WBV2-P1424-001/manifest.json`（期望 212423 bytes，原样）
+- 保留 continuation：`tests/golden/WBV2-P1424-001/continuation-20261103-goal-numpy.json`
+- 新计划：`tests/golden/WBV2-P1425-000/domain-parity-plan.json`
+
+## 验收
+
+- P1424-001 manifest 字节级不变；桥接 manifest 为 done 且 nextTask 指向 `WBV2-P1425-000`。
+- 负例：P1424-001 manifest 大小变化、continuation 缺失或队列已被再次切换时拒绝继续。
+- 校验：`node tools/web/check-execution-control-plane.mjs`
+
+## 交付与回滚
+
+- 交付桥接 manifest/status/report；回滚把队列恢复为 `WBV2-P1424-001` 并删除桥接指针，不删除任何证据。