Why: the docs said to discard a refreshed apm.lock.yaml on a feature
branch because the refresh records main's commit, but the branch's own
lock records a (older) main commit too, and the SessionStart notice gave
the same "commit or discard" advice on every branch.
Implementation Notes:
- check-apm-current.sh picks fixed advice by branch: commit or discard
deliberately on the default branch (origin/HEAD, else main), discard and
reinstall on a feature branch; the branch name is never interpolated.
- README, AGENTS.md and ADR-0019 give the real reasons (no lock churn in
the branch diff, deployed tree matches the committed lock), the cost
(the session runs the older main) and that the next session start
refreshes again.
- ADR-0019's check-clean and stale-server claims restated to match apm's
source.
ADR: 0019
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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