zhukang
1cb9a42c7b
fix: enforce recovery retention and fail-closed restore semantics
- prune expired recovery items on load/save and reject expired restores at worker boundary
- add restoreExpired and restoreConflict protocol/application error mapping
- disable expired restore actions in History and reload persisted state after restore failures
- add recovery expiry/conflict coverage plus sync protocol, architecture, state-machine, and recovery contract docs
- wire AtlasAppTests into the shared Xcode scheme and add app-layer regression coverage for expired restore reload behavior
Refs: ATL-221 ATL-222 ATL-223 ATL-224 ATL-225, vibe-kanban SID-9