chore(web): checkpoint continuous P42 execution

docs/tasks/WBV2-P42-001.md

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+# WBV2-P42-001: refresh_continuous_integrity
+
+- task: WBV2-P42-001
+- parent: WBV2-P42-000
+- status: in_progress
+- gap: workflow:refresh_continuous_integrity
+- ownerFamily: RELEASE
+- targetImplementationClass: SOURCE_BACKED
+
+## 目标
+
+Refresh implementation hashes and source-build bindings.
+
+## 输入与范围
+
+- Focused protocol: `web/protocol/web-engine.ts`
+- Implementation entrypoint: `node tools/web/generate-wbv2-continuous-slice.mjs --task WBV2-P42-001 --write`
+
+## 验收
+
+- real source or WebEngine Main path is wired
+- worker/client/frontend route uses typed protocol without a duplicate shim
+- malformed, unsupported, hash-drift or false-completion input fails closed
+- implementation smoke is reproducible; Chromium receipts, undo/redo, save/reopen and deterministic verification remain deferred
+- `node tools/web/check-task-context.mjs --task WBV2-P42-001 --write`
+
+## 失败边界
+
+- integrity drift, unavailable build inputs and unknown command results keep the task in_progress or blocked
+- implementation evidence never changes historical inventory or provenance
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P42-001/`
+- Status: `docs/status/WBV2-P42-001.md`
+- Manifest: `tests/golden/WBV2-P42-001/manifest.json`
+- Rollback: restore WBV2-P42-000 as queue parent and leave the task in_progress.

docs/tasks/WBV2-P42-002.md

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+# WBV2-P42-002: rebuild_continuous_bundle
+
+- task: WBV2-P42-002
+- parent: WBV2-P42-001
+- status: planned
+- gap: workflow:rebuild_continuous_bundle
+- ownerFamily: RELEASE
+- targetImplementationClass: SOURCE_BACKED
+
+## 目标
+
+Rebuild the frontend release bundle from the current source-backed WASM.
+
+## 输入与范围
+
+- Focused protocol: `web/protocol/web-engine.ts`
+- Implementation entrypoint: `node tools/web/generate-wbv2-continuous-slice.mjs --task WBV2-P42-002 --write`
+
+## 验收
+
+- real source or WebEngine Main path is wired
+- worker/client/frontend route uses typed protocol without a duplicate shim
+- malformed, unsupported, hash-drift or false-completion input fails closed
+- implementation smoke is reproducible; Chromium receipts, undo/redo, save/reopen and deterministic verification remain deferred
+- `node tools/web/check-task-context.mjs --task WBV2-P42-002 --write`
+
+## 失败边界
+
+- integrity drift, unavailable build inputs and unknown command results keep the task in_progress or blocked
+- implementation evidence never changes historical inventory or provenance
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P42-002/`
+- Status: `docs/status/WBV2-P42-002.md`
+- Manifest: `tests/golden/WBV2-P42-002/manifest.json`
+- Rollback: restore WBV2-P42-001 as queue parent and leave the task in_progress.

docs/tasks/WBV2-P42-003.md

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+# WBV2-P42-003: run_continuous_smoke
+
+- task: WBV2-P42-003
+- parent: WBV2-P42-002
+- status: planned
+- gap: workflow:run_continuous_smoke
+- ownerFamily: RELEASE
+- targetImplementationClass: SOURCE_BACKED
+
+## 目标
+
+Run compact handoff and build integrity smoke.
+
+## 输入与范围
+
+- Focused protocol: `web/protocol/web-engine.ts`
+- Implementation entrypoint: `node tools/web/generate-wbv2-continuous-slice.mjs --task WBV2-P42-003 --write`
+
+## 验收
+
+- real source or WebEngine Main path is wired
+- worker/client/frontend route uses typed protocol without a duplicate shim
+- malformed, unsupported, hash-drift or false-completion input fails closed
+- implementation smoke is reproducible; Chromium receipts, undo/redo, save/reopen and deterministic verification remain deferred
+- `node tools/web/check-task-context.mjs --task WBV2-P42-003 --write`
+
+## 失败边界
+
+- integrity drift, unavailable build inputs and unknown command results keep the task in_progress or blocked
+- implementation evidence never changes historical inventory or provenance
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P42-003/`
+- Status: `docs/status/WBV2-P42-003.md`
+- Manifest: `tests/golden/WBV2-P42-003/manifest.json`
+- Rollback: restore WBV2-P42-002 as queue parent and leave the task in_progress.

docs/tasks/WBV2-P43-000.md

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+# WBV2-P43-000: authorize_continuous_wave
+
+- task: WBV2-P43-000
+- parent: WBV2-P42-003
+- status: in_progress
+- gap: workflow:authorize_continuous_wave
+- ownerFamily: PROGRAM
+- targetImplementationClass: SOURCE_BACKED
+
+## 目标
+
+Authorize the next source-backed implementation wave.
+
+## 输入与范围
+
+- Focused protocol: `web/protocol/web-engine.ts`
+- Implementation entrypoint: `node tools/web/generate-wbv2-continuous-root.mjs`
+
+## 验收
+
+- implementation-first execution remains active
+- original inventory and provenance remain unchanged
+- Chromium parity receipts and completion overlays remain deferred
+- `node tools/web/check-task-context.mjs --task WBV2-P43-000 --write`
+
+## 失败边界
+
+- malformed, unsupported and hash-drift inputs fail closed
+- implementation evidence never changes historical provenance
+
+## 交付与回滚
+
+- Reports: `tests/golden/WBV2-P43-000/`
+- Status: `docs/status/WBV2-P43-000.md`
+- Manifest: `tests/golden/WBV2-P43-000/manifest.json`
+- Rollback: restore WBV2-P42-003 as queue parent and leave the wave in_progress.