feat(01-03): refactor scrape_schedules.py to orchestrator
Transform monolithic 3359-line script into thin 733-line orchestrator:
- Import core utilities from core.py (Game, Stadium, fallback system)
- Import MLB/NBA/NHL/NFL scrapers from dedicated sport modules
- Core sports now use module convenience functions (scrape_{sport}_games)
- Non-core sports (WNBA, MLS, NWSL, CBB) remain inline with TODO markers
- CLI unchanged: --sport, --season, --stadiums-only, --stadiums-update
- 78% reduction in orchestrator size (3359 -> 733 lines)
Phase 1: Script Architecture complete - all 4 core sports modularized.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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