phase 17: quote reserved word 'window' in all SQL queries across recommendation worker and query API

services/recommendation/worker.py

@@ -74,7 +74,7 @@ WHERE d.id = ANY(
         || COALESCE(tw.top_opposing_evidence, '[]'::jsonb)
     )::uuid
     FROM trend_windows tw
-    WHERE tw.entity_id = $1 AND tw.window = $2
+    WHERE tw.entity_id = $1 AND tw."window" = $2
     ORDER BY tw.generated_at DESC
     LIMIT 1
 )
@@ -117,12 +117,12 @@ async def fetch_data_quality_context(
 
 _LATEST_TREND_QUERY = """
 SELECT
-    entity_type, entity_id, window, trend_direction, trend_strength,
+    entity_type, entity_id, "window", trend_direction, trend_strength,
     confidence, top_supporting_evidence, top_opposing_evidence,
     dominant_catalysts, material_risks, contradiction_score,
     disagreement_details, market_context, generated_at
 FROM trend_windows
-WHERE entity_id = $1 AND window = $2
+WHERE entity_id = $1 AND "window" = $2
 ORDER BY generated_at DESC
 LIMIT 1
 """