fix+logging: model load logging, CPU fallback, log level audit

Bugs fixed (from high-effort review):
- InsightFace CPU fallback now passes providers=['CPUExecutionProvider'] and
  wraps in _suppress_output() so broken GPU drivers don't cause fallback to
  try the same broken provider again, and C-extension noise stays suppressed
- scheduler.py: BaseException → Exception (KeyboardInterrupt already re-raised;
  winnow has no sys.exit() calls, so SystemExit would not occur, but Exception
  is the correct scope)
- compose.yml: fix inverted AUTO_MODE comment (docker run -it enables
  interactive mode via TTY, not non-interactive)

Model loading logging (embeddings.py):
- InsightFace: disk cache check, "not cached — downloading now (~300 MB)",
  "loading into memory on GPU/CPU...", "ready on GPU/CPU (Xs)"
- SigLIP: same treatment; cache path derived dynamically from model_name
  via HuggingFace slug convention (models--org--model) so it stays correct
  if the model variant ever changes

Logging level audit (INFO/DEBUG/WARNING/ERROR):
- diversity.py: internal algo steps (clustering, medoids, adaptive threshold,
  auto-stop decision) → DEBUG; final selection summaries stay INFO
- immich_api.py: "Fetching assets" and "Retained N assets" → DEBUG (callers
  already print this to the console via rprint)

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

scheduler.py

@@ -45,7 +45,7 @@ while True:
             print("winnow run complete", flush=True)
         except KeyboardInterrupt:
             raise
-        except BaseException as e:
+        except Exception as e:
             logger.error(f"winnow run failed: {e}", exc_info=True)
             print(f"winnow run failed: {e}", flush=True)
         next_run = cron.get_next(float)