Strengthen out-of-season holiday filtering in discover recommendations

[dannyvfilms]

The previous out-of-season penalty (-0.14) was too weak to suppress Christmas movies (e.g. The Grinch, Jack Frost) in the "Top Picks For You" and "Comfort Rewatches" rows during non-holiday months. A highly-rated Christmas movie could score ~0.46 even after the penalty, still ranking in the top results.

Two changes:

• Increase the out-of-season penalty from -0.14 to -0.40, which drops a full-strength holiday item from ~0.60 to ~0.20, pushing it well below typical non-holiday candidates.
• Expand HOLIDAY_STRONG_TERMS to include "grinch", "krampus", and "nutcracker", and HOLIDAY_SOFT_TERMS to include "jack frost" and "santa claus", so iconic Christmas characters in titles are caught even when TMDB keyword tags are absent.

https://claude.ai/code/session_01XpYeZusWXu9yNUZiZMqzVw

Summary

• Describe what changed and why.

Validation

• List commands run and outcomes.

Migration Sync Gate (Required for dev -> latest sync PRs)

• Conflicts resolved with upstream files preserved and fork behavior merged intentionally.
• Migration conflicts handled per policy (no rewrite of shared/released migrations).
• cd src && python manage.py makemigrations --merge run for affected apps.
• cd src && python manage.py check_migration_hygiene --strict passed.
• scripts/replay_upgrade_matrix.sh --from-tag <previous_release_tag> --to-ref latest --db sqlite,postgres --with-drift-scenarios passed.
• coverage run src/manage.py test app users integrations lists events --parallel passed.

Notes

• Link relevant issues (for example: Refs #101).