decisions: M5b settles the invalid-arguments reason, tag neutralisation and the shared secret store (their open rows go), and the verdict on the run's two driver trials. CLAUDE.md's current state: M5b done, M5c (Honcho, roncho 1.0.0) next; straylight's clone is boxmaker-m5b. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>