Closes#202
Adds app/services/refractor_service.py with two service functions:
- ensure_variant_cards: idempotent function that creates missing variant
cards for all tiers up to a target, with partial failure handling and
REFRACTOR_BOOST_ENABLED kill switch support.
- evaluate_and_boost: combines evaluate_card(dry_run=True) with
ensure_variant_cards so both tier computation and variant-card creation
happen in one testable call without HTTP round-trips.
Updates both router endpoints to use evaluate_and_boost:
- POST /cards/{card_id}/evaluate now calls evaluate_and_boost instead of
evaluate_card directly, which also fixes the broken variant creation on
the manual evaluate path (variant cards are now created when a tier-up
is detected, not just recorded).
- POST /evaluate-game/{game_id} replaces ~55 lines of inline boost
orchestration (boost_enabled flag, tier loop, partial failure tracking,
card_type/track null checks) with a single evaluate_and_boost call.
Response shape is unchanged.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
