docs(04-01): complete canonical linking phase

Create 04-01-SUMMARY.md documenting:
- 5760 games canonicalized with 100% resolution rate
- 3 team aliases added (WSH, NY, ATX)
- All validation checks passed

Update STATE.md:
- Phase 4 complete (11/19 plans done, 58%)
- Add 04-01 decision on iterative alias discovery

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/phases/04-canonical-linking/04-01-SUMMARY.md

@@ -0,0 +1,105 @@
+---
+phase: 04-canonical-linking
+plan: 01
+subsystem: data-pipeline
+tags: [games, canonicalization, linking, validation]
+
+requires:
+  - phase: 03-alias-systems
+    provides: Team/stadium aliases for all 7 sports
+
+provides:
+  - Canonical games with resolved team/stadium links
+  - Validated game-team-stadium relationships
+
+affects: [05-cloudkit-crud, ios-app-data]
+
+tech-stack:
+  added: []
+  patterns: [game-canonicalization, link-validation, team-abbreviation-aliases]
+
+key-files:
+  created:
+    - Scripts/data/games_canonical.json
+    - Scripts/data/game_resolution_warnings.json
+  modified:
+    - Scripts/canonicalize_games.py
+
+key-decisions:
+  - Added 3 missing team abbreviation aliases discovered during canonicalization (WSH->WAS for NFL, NY->NYRB and ATX->AUS for MLS)
+  - NFL playoff placeholder games (TBD/AFC/NFC) are expected warnings and do not require fixes
+
+patterns-established:
+  - Team abbreviation alias discovery during canonicalization run
+  - Iterative alias refinement based on resolution warnings
+
+issues-created: []
+
+duration: 4 min
+completed: 2026-01-10
+---
+
+# Phase 4 Plan 01: Canonical Linking Summary
+
+**5760 games canonicalized with 100% team/stadium resolution rate (excluding 8 expected NFL playoff placeholders)**
+
+## Performance
+
+- Duration: ~4 minutes
+- Start: 2026-01-10 09:54
+- End: 2026-01-10 09:58
+- Tasks completed: 3 of 3
+
+## Accomplishments
+
+1. **Game Canonicalization Pipeline**: Generated `games_canonical.json` with 5760 canonical games across 5 sports
+   - NBA: 1230 games
+   - MLB: 2430 games
+   - NHL: 1312 games
+   - NFL: 278 games
+   - MLS: 510 games
+
+2. **Team Alias Resolution**: Added 3 missing team abbreviation aliases to handle data source variations:
+   - `('NFL', 'WSH'): 'team_nfl_was'` - Washington Commanders alternate
+   - `('MLS', 'NY'): 'team_mls_nyrb'` - NY Red Bulls short form
+   - `('MLS', 'ATX'): 'team_mls_aus'` - Austin FC alternate
+
+3. **Validation**: All canonical links validated successfully
+   - 0 errors, 0 warnings
+   - All 5760 games have valid `home_team_canonical_id`
+   - All 5760 games have valid `away_team_canonical_id`
+   - All 5760 games have valid `stadium_canonical_id`
+   - No `team_unknown_*` or `stadium_unknown_*` references
+
+4. **Expected Warnings**: 8 NFL playoff placeholder games excluded (TBD/AFC/NFC teams will be updated when playoffs begin)
+
+## Files Created/Modified
+
+| File | Description |
+|------|-------------|
+| `Scripts/data/games_canonical.json` | 2.0MB - 5760 canonical games with resolved team/stadium links |
+| `Scripts/data/game_resolution_warnings.json` | 8 expected NFL playoff placeholder warnings |
+| `Scripts/canonicalize_games.py` | Added 3 team abbreviation aliases |
+
+## Task Commits
+
+| Task | Commit | Files |
+|------|--------|-------|
+| Task 1: Run game canonicalization | b628611 | canonicalize_games.py, games_canonical.json, game_resolution_warnings.json |
+| Task 2: Validate canonical links | (validation only) | No file changes |
+| Task 3: Fix resolution issues | (no issues found) | No changes needed |
+
+## Deviations from Plan
+
+- **Auto-fix applied**: During Task 1, discovered 3 missing team aliases (WSH, NY, ATX) that caused 85 games to fail resolution. Fixed immediately by adding aliases to TEAM_ABBREV_ALIASES and re-running canonicalization. This is consistent with Task 3's purpose but was handled proactively.
+
+## Issues Encountered
+
+None. All tasks completed successfully.
+
+## Next Phase Readiness
+
+Ready for **Phase 5: CloudKit CRUD**
+- `games_canonical.json` contains 5760 games with complete team/stadium linking
+- All canonical IDs resolve to valid entries
+- Data validated and ready for CloudKit upload