Tasks 01 to 22, the review, and task 23 (the review fixes, with a second, independent review of them). The one conflict, docs/implementer-lessons.md, had the same T18 and T19 on both sides; m3a's T20 to T22 follow them. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>