plan/STATUS.md: what the last session changed, what to pick up next, and the handful of things that were learned the hard way and would otherwise have to be rediscovered. Linked from the overview, which now also lists plans 13 and 14 alongside the earlier phases. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_015CYEJKobJ2Re4Dv7qUoSA7