v0.2.1

Changelog

• f06a29f docs: add make cover to CLAUDE.md
• 479c7c2 feat: add coverage check to make check (75% threshold)
• 0200851 fix: CI skill-scanner path, replace -99 with dash in observe
• e5f5cac fix: filter observe stations by city on client side
• 8b52bf9 test: add format.go unit tests, coverage 58% → 90%