fix: green full-suite after main product drift (#2275)
## Summary
Follow-up after #2266: full suite on latest `main` still failed on i18n
parity and engine product-drift tests (duplicate flagging, mission
validator signature, worktree path reservation, pi ModelRuntime,
assigned-agent PG layer).
## Changes
- **i18n**: add `listView/tasks.statusReplan` and mobile-nav settings
keys to es/fr/ko/zh-CN/zh-TW
- **triage**: opt-in `triageDuplicateResolution: "delete"` coverage +
default prompt/flag path; stub `recordActivity`
- **MCP PR response**: stub `getTask` for merger model resolution
- **pi-layers**: mock `ModelRuntime.create` (FN-8142)
- **assigned-agent**: stub `getAsyncLayer` for authoritative AgentStore
fallback
- **mission validation**: `startValidatorRun(..., taskId)` +
`runValidation` `{ result, inspection }` shape
- **worktree acquisition**: real temp roots for path reservation;
probe-aware worktrunk failure fixture
- **useBlockerFanout**: read `MAX_AUTO_MERGE_RETRIES` from
`self-healing-constants.ts` (wave-8 peel)
## Test plan
- [x] Targeted engine suites above (48 tests)
- [x] i18n parity + gate coverage
- [x] useBlockerFanout
- [x] `pnpm test:gate`
- [ ] Full Suite (non-blocking) on PR
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Localization**
* Added “Replan”/replanning status labels across Spanish, French,
Korean, Simplified Chinese, and Traditional Chinese.
* Completed settings mobile navigation translations, including primary
items controls and reordering options.
* **Tests**
* Expanded coverage for validation recovery and task forwarding
behavior.
* Improved duplicate-resolution scenarios (including activity recording
and lineage deletion behavior).
* Increased test reliability for worktree acquisition by using temporary
filesystem roots.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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