fix: audit — score falsy-zero, crop person mismatch, adaptive cap, suppress_output, ldconfig glob, scheduler sleep

- immich_api: `score or confidence` treated 0.0 score as falsy; use explicit None check
- diversity: same falsy-zero fix in _get_face_confidence
- diversity: _crop_face_from_thumbnail scale loop now filters by person_id (was
  using first person's imageWidth/imageHeight regardless of target in group photos)
- jobs: partially-trained auto mode kept limit="auto" for adaptive stopping, then
  caps result to remaining capacity (was converting to int, silently disabling FPS
  adaptive threshold and early-stop)
- embeddings: _suppress_output finally block wraps first dup2 in try/finally so
  stderr is always restored even if stdout restore raises OSError
- Dockerfile: ldconfig find uses python3.* glob instead of hardcoded python3.13
- scheduler: sleep until next_run instead of fixed 60s; eliminates late-fire jitter
  and unnecessary wakeups on long schedules

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

winnow/embeddings.py

@@ -33,8 +33,10 @@ def _suppress_output():
         os.dup2(devnull_fd, 2)
         yield
     finally:
-        os.dup2(saved_out, 1)
-        os.dup2(saved_err, 2)
+        try:
+            os.dup2(saved_out, 1)
+        finally:
+            os.dup2(saved_err, 2)
         os.close(devnull_fd)
         os.close(saved_out)
         os.close(saved_err)