v0.2.0

Added

• --check-commit FILE gate: exit 0 only if the commit message names a
  logged decision (AREA:/LOG: marker), mechanically enforced by a new
  commit-message gate (log-before-fix) CI job - the AREA marker is now
  enforced in CI, mirroring agent-error-log.
• Companion badge in the README badge row linking agent-error-log - the
  ecosystem cross-link is visible at the top of the page, not only in the
  bottom Companion section.
• AGENTS.md section 7 (Committing): the AREA-marker gate is documented
  for AI agents, matching the enforced reality.
• Branch protection on master: direct pushes are rejected (GH006 verified
  live), so changes ship via the PR flow like the sibling.
• 7 new unit tests (104 total).