Fixes the race condition where the todo continuation hook would inject a
continuation prompt even when all todos had been completed during the
countdown period.
The root cause was that executeAfterCountdown() used stale todo data from
the initial session.idle check without re-verifying that incomplete todos
still existed after the countdown finished.
Changes:
- Add fresh todo verification in executeAfterCountdown() before prompt injection
- Use fresh todo data in the continuation prompt message
- Abort injection if no incomplete todos remain after countdown
This properly handles the case where:
1. session.idle fires (e.g., user enters shell mode in TUI)
2. Initial check finds incomplete todos, starts countdown
3. During countdown, todos get completed
4. Countdown ends, fresh check detects no incomplete todos
5. Hook aborts instead of injecting stale prompt
Fixes#234
Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>
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