Loki Mode

Fixed

• Project registry concurrent-write race: dashboard/registry.py _save_registry
  now writes atomically (temp file in the registry dir + os.replace) so a reader
  never sees a torn file, and the leaf mutators (register_project,
  unregister_project, update_last_accessed, mark_project_stopped) take a
  best-effort advisory file lock (graceful fallback when fcntl is unavailable).
  Matters most now that multi-repo loki docker makes concurrent registration the
  common path.

Changed

• DOCKER_README.md documents that the dashboard Stop for a loki docker project is
  honored at the next iteration boundary (writes .loki/STOP, the runner polls
  it), so Stop is reliable but not instant for containerized builds;
  docker stop loki-<hash> stops immediately.

Notes

• The published v7.45.0 image was validated end-to-end: loki docker start
  against the published asklokesh/loki-mode:7.45.0 built a working app and
  committed as the correct GitHub identity (asklokesh), confirming the v7.45.0
  Docker fixes work in the real artifact.