- Add DraftSheetService with write_pick(), write_picks_batch(),
clear_picks_range(), and get_sheet_url() methods
- Integrate sheet writes in /draft command (fire-and-forget pattern)
- Integrate sheet writes in draft_monitor.py for auto-draft picks
- Add /draft-admin resync-sheet command for bulk recovery
- Add sheet link to /draft-status embed
- Add draft_sheet_keys config with env var overrides per season
- Add get_picks_with_players() to draft_pick_service for resync
- Add 13 unit tests for DraftSheetService (all passing)
- Update CLAUDE.md documentation files
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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