release: v0.5.14 — graceful fallback for invalid numeric env vars

YEARS_FILTER, MIN_FACE_WIDTH, MIN_FACE_COUNT, MAX_AUTO_IMAGES,
BLUR_THRESHOLD, MIN_CONFIDENCE, and FACE_MARGIN used bare int()/float()
calls with no error handler. A typo (trailing space, non-numeric value)
raised ValueError inside __getattr__, producing a cryptic traceback on
the first config access rather than at the validate() step. Values are
now parsed by _getenv_int/_getenv_float helpers that warn and fall back
to the documented default, matching the existing FRIGATE_SCORE_CEILING
pattern.

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "winnow"
-version = "0.5.13"
+version = "0.5.14"
 description = "Selects diverse, high-quality photos from Immich as training data for Frigate face recognition."
 license = "AGPL-3.0-or-later"
 requires-python = ">=3.13"