fix: update pipeline imports to use sport modules

After Phase 1 refactoring moved scraper functions to sport-specific
modules (nba.py, mlb.py, etc.), these pipeline scripts still imported
from scrape_schedules.py.

- run_pipeline.py: import from core.py and sport modules
- validate_data.py: import from core.py and sport modules
- run_canonicalization_pipeline.py: import from core.py and sport modules

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

Scripts/validate_data.py

@@ -16,17 +16,19 @@ from dataclasses import dataclass, asdict, field
 from typing import Optional
 from collections import defaultdict
 
-# Import scrapers from main script
+# Import from core module
+from core import Game, Stadium, assign_stable_ids
+
+# Import from sport modules
+from nba import scrape_nba_basketball_reference, NBA_TEAMS
+from mlb import scrape_mlb_statsapi, scrape_mlb_baseball_reference, MLB_TEAMS
+from nhl import scrape_nhl_hockey_reference, NHL_TEAMS
+from nfl import scrape_nfl_espn, NFL_TEAMS
+
+# Import secondary sports from scrape_schedules (stubs)
 from scrape_schedules import (
-    Game, Stadium,
-    scrape_nba_basketball_reference,
-    scrape_mlb_statsapi, scrape_mlb_baseball_reference,
-    scrape_nhl_hockey_reference,
-    scrape_wnba_espn, scrape_mls_espn, scrape_nwsl_espn,
-    scrape_nfl_espn, scrape_cbb_espn,
-    NBA_TEAMS, MLB_TEAMS, NHL_TEAMS, WNBA_TEAMS, MLS_TEAMS, NWSL_TEAMS,
-    NFL_TEAMS,
-    assign_stable_ids,
+    scrape_wnba_espn, scrape_mls_espn, scrape_nwsl_espn, scrape_cbb_espn,
+    WNBA_TEAMS, MLS_TEAMS, NWSL_TEAMS,
 )