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/run_pipeline.py

@@ -21,17 +21,20 @@ from dataclasses import dataclass
 from typing import Optional
 from enum import Enum
 
-# Import our modules
-from scrape_schedules import (
+# Import from core module
+from core import (
     Game, Stadium, ScraperSource, scrape_with_fallback,
-    # NBA sources
-    scrape_nba_basketball_reference, scrape_nba_espn, scrape_nba_cbssports,
-    # MLB sources
-    scrape_mlb_statsapi, scrape_mlb_baseball_reference, scrape_mlb_espn,
-    # NHL sources
-    scrape_nhl_hockey_reference, scrape_nhl_espn, scrape_nhl_api,
-    # NFL sources
-    scrape_nfl_espn, scrape_nfl_pro_football_reference, scrape_nfl_cbssports,
+    assign_stable_ids, export_to_json,
+)
+
+# Import from sport modules
+from nba import scrape_nba_basketball_reference, scrape_nba_espn, scrape_nba_cbssports
+from mlb import scrape_mlb_statsapi, scrape_mlb_baseball_reference, scrape_mlb_espn
+from nhl import scrape_nhl_hockey_reference, scrape_nhl_espn, scrape_nhl_api
+from nfl import scrape_nfl_espn, scrape_nfl_pro_football_reference, scrape_nfl_cbssports
+
+# Import secondary sports from scrape_schedules (stubs)
+from scrape_schedules import (
     # WNBA sources
     scrape_wnba_espn, scrape_wnba_basketball_reference, scrape_wnba_cbssports,
     # MLS sources
@@ -42,8 +45,6 @@ from scrape_schedules import (
     scrape_cbb_espn, scrape_cbb_sports_reference, scrape_cbb_cbssports,
     # Utilities
     generate_stadiums_from_teams,
-    export_to_json,
-    assign_stable_ids,
 )
 from validate_data import (
     validate_games,