Task 08's `header` was one todo!() with a dozen branches; Ornith planned it in its head until the turn ran out (tip T25). `next_message` and `header` are now written as glue over seven small helpers, and task 09's `poll` over four, each checked to pass when filled from its comments. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>