- docs/skill.md teaches a Claude what Logbuch is for, how an entry sounds
and in which order the calls go, served at GET /api/v1/skill and as a
download next to the spec and the guide
- a test keeps the skill from drifting: frontmatter, only endpoints that
exist, house rules
- resolveClient stamps last_used_at, the access list said never used even
after eleven entries
