## Summary
- Two mid-turn compaction tests in `local_agent_handler.test.ts` were
failing because mock messages lacked `createdAt` fields
- `buildChatMessageHistory` and `getMidTurnCompactionSummaryIds` call
`createdAt.getTime()` to detect mid-turn compaction summaries, causing a
silent TypeError inside the async generator
- Added `createdAt` timestamps to all mock messages and compaction
summary messages in both tests

## Test plan
- [x] `npm test` passes (786/786 tests)
- [x] Both previously-failing mid-turn compaction tests now pass
- [x] Lint, formatting, and type checks all pass

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Fix failing mid-turn compaction tests by adding createdAt timestamps to
mocked chat and summary messages. This prevents a silent TypeError in
the async generator and restores test reliability.

- **Bug Fixes**
- Added createdAt to all test messages (including compaction summaries)
so buildChatMessageHistory and getMidTurnCompactionSummaryIds can safely
call createdAt.getTime().
- Documented the createdAt requirement for compaction tests in
AGENTS.md.

<sup>Written for commit c8f0acb09058c5e3313f1423c585857ea61416f4.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>