fix: stale __version__, scheduler import order, quality test coverage

- __init__.py: derive __version__ from importlib.metadata instead of
  a hardcoded "0.1.0" that was six releases out of date
- scheduler.py: move winnow.cli import to module top (no more noqa);
  clean up redundant bool variables in check_models
- tests/test_quality.py: 17 tests covering all five quality check
  functions individually plus assess_quality integration cases

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

winnow/__init__.py

@@ -5,4 +5,9 @@ Immich library for Frigate's Face Recognition (ArcFace) and Object/State
 Classification models.
 """
 
-__version__ = "0.1.0"
+from importlib.metadata import PackageNotFoundError, version
+
+try:
+    __version__ = version("winnow")
+except PackageNotFoundError:
+    __version__ = "unknown"