# Review by Linus Torvalds (Round 1)

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VERDICT: request-changes

FINDINGS:
- [src/colonyos/daemon.py]: `daily_thread_hour` config field is validated and stored but never used — `_should_rotate_daily_thread()` rotates at midnight (date change) not at the configured hour. FR-3 specifies rotation at the configured hour.
- [src/colonyos/daemon.py]: Three redundant inline `from zoneinfo import ZoneInfo` imports across adjacent methods. Consolidate.
- [src/colonyos/config.py]: `except (KeyError, Exception)` is redundant — `Exception` subsumes `KeyError`.

SYNTHESIS:
This is solid, well-structured work. The data model changes are minimal and correct. The routing logic in `_post_slack_message` is clean — a single `critical` flag controls the behavior, no overengineered abstractions. The `format_daily_summary` function is pure formatting with no hidden side effects — show me the data structures and I'll understand the code, and this function does exactly that. Test coverage is thorough with 50 new tests (488 total, zero regressions) including integration scenarios for restart recovery and multi-item threading.

The one real problem is that `daily_thread_hour` is dead config — it's parsed, validated, stored, and then completely ignored. The thread rotates on date change (midnight in the configured timezone), not at the configured hour as specified in FR-3 and the documented lifecycle in section 6.2 of the PRD. `_should_rotate_daily_thread()` compares today's date string against the stored date, which means rotation happens at midnight regardless of what `daily_thread_hour` is set to. That's not what the PRD says. Fix the rotation logic to respect the hour, and this is ready to ship.