- config: switch Settings to ConfigDict(extra='ignore') so extra env vars
(spoonacular_api_key, SWIFTLY_BEARER_TOKEN) don't crash import.
Remove deprecated class Config.
- email: wrap SendGrid imports in try/except so the module loads without
the optional dependency. Update test_email_backend to patch Mail/RepyTo.
- planner_select: default PlannerConfig.set_size=21 (3 meals/day × 7) is
way too large for the unit test assertion that checks 3-recipe diversity.
Introduced _CFG_3 with set_size=3 and applied to all tests.
- Delete stale test_matcher.py importing removed functions.
Full suite: 46 passed, 74 skipped (Postgres), 0 failed, 120 collected.