Add progress counter and faces-pending sentinel bypass to update.rb

- process_dir() takes idx/total args and prints [N/total] prefix on every
  Scanning/Skipping line so long runs are easy to monitor via tail -f
- faces_pending?() checks album.json for any image with faces: null when
  faces.enabled is true; if found, the sentinel skip is bypassed so those
  images get processed even though the directory mtime hasn't changed
- This handles the case where face detection is newly enabled on a library
  that was previously indexed without it — no --force needed on subsequent
  runs after the initial catch-up

Resume after abort: sentinel is only touched after atomic_write_json, so
an aborted directory reruns cleanly. Already-completed directories skip
normally; partially-detected batches rerun from scratch (safe/idempotent).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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