Add SKU-scoped PChome rescore pilot

tests/test_competitor_match_attempt_rescore_audit.py

@@ -145,6 +145,32 @@ def test_fetch_match_attempt_rescore_rows_defaults_to_latest_sku_state():
     assert {row["sku"] for row in historical_rows} == {"SKU-A", "SKU-B"}
 
 
+def test_fetch_match_attempt_rescore_rows_can_limit_to_specific_skus():
+    from services.competitor_match_attempt_rescore_audit import fetch_match_attempt_rescore_rows
+
+    engine = create_engine("sqlite:///:memory:")
+    with engine.begin() as conn:
+        _create_match_attempts_table(conn)
+        conn.execute(text("""
+            INSERT INTO competitor_match_attempts
+                (sku, source, attempt_status, momo_product_name, best_competitor_product_id,
+                 best_competitor_product_name, best_match_score, diagnostic_codes, attempted_at)
+            VALUES
+                ('SKU-A', 'pchome', 'true_low_confidence', 'MOMO A', 'P-A', 'PChome A', 0.82, '["current_low"]', '2026-05-24 09:00:00'),
+                ('SKU-B', 'pchome', 'true_low_confidence', 'MOMO B', 'P-B', 'PChome B', 0.83, '["current_low"]', '2026-05-24 10:00:00'),
+                ('SKU-C', 'pchome', 'true_low_confidence', 'MOMO C', 'P-C', 'PChome C', 0.84, '["current_low"]', '2026-05-24 11:00:00')
+        """))
+
+        rows = fetch_match_attempt_rescore_rows(
+            conn,
+            statuses=("true_low_confidence",),
+            skus=("SKU-A", "SKU-C"),
+            limit=10,
+        )
+
+    assert [row["sku"] for row in rows] == ["SKU-C", "SKU-A"]
+
+
 def test_match_attempt_rescore_materializes_accepted_current_for_manual_review():
     from services.competitor_match_attempt_rescore_audit import materialize_rescore_accept_reviews