createSession captured a TaskStore but submitResponse/retrySession/
rewindSession had no way to receive one — so rehydrated sessions
(loaded from SQLite, no prior createSession call) failed with
"Planning session has no task store and cannot be resumed without
project context" when they needed to rebuild an agent.
- Add optional `store` to Session and capture it on createSession.
- Extend submitResponse, retrySession, rewindSession to accept and
propagate a store argument; ensureSessionAgent falls back to the
session-captured value when the caller doesn't plumb one.
- Update planning.test.ts rehydration paths to pass MOCK_TASK_STORE
where they previously relied on the implicit error to test against.
Fixes 7 failing tests in planning.test.ts (rehydration + retry/rewind
flows). Same pattern applies to mission-interview.ts and the related
session-* test files but is deferred to a separate commit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
329b74416d