fix(growth): normalize nested marketplace packs

tests/test_marketplace_product_matcher.py

@@ -3443,6 +3443,7 @@ def test_marketplace_search_terms_prefer_readable_brand_core_spec():
 
 def test_marketplace_sheet_count_is_structured_for_search_and_identity():
     from services.marketplace_product_matcher import (
+        build_unit_price_comparison,
         build_search_terms,
         parse_product_identity,
         score_marketplace_match,
@@ -3450,15 +3451,21 @@ def test_marketplace_sheet_count_is_structured_for_search_and_identity():
 
     pchome_name = "GATSBY 潔面濕紙巾超值包42張入"
     same_pack = "【GATSBY】潔面濕紙巾超值包42張入(2款任選)"
+    multi_pack = "【GATSBY】潔面濕紙巾超值包42張入*4包(4款任選)"
     different_pack = "【GATSBY】潔面濕紙巾15張入(3款任選)"
 
     identity = parse_product_identity(pchome_name)
+    multi_pack_identity = parse_product_identity(multi_pack)
     terms = build_search_terms(pchome_name, max_terms=5)
     exact = score_marketplace_match(same_pack, pchome_name)
+    normalized = score_marketplace_match(multi_pack, pchome_name)
+    unit_price = build_unit_price_comparison(multi_pack, pchome_name, 495, 199)
     rejected = score_marketplace_match(different_pack, pchome_name)
 
     assert (42, "張") in identity.counts
     assert identity.total_piece_count == 42
+    assert (4, "包") in multi_pack_identity.counts
+    assert multi_pack_identity.total_piece_count == 168
     assert terms[0] == "gatsby 潔面濕紙巾 42張"
     assert not any(term in {"gatsby 張入", "張入"} for term in terms)
     assert exact.hard_veto is False
@@ -3467,6 +3474,16 @@ def test_marketplace_sheet_count_is_structured_for_search_and_identity():
     assert exact.alert_tier == "price_alert_exact"
     assert exact.spec_score == 1.0
     assert "spec_name_alignment" in exact.reasons
+    assert normalized.hard_veto is True
+    assert normalized.comparison_mode == "unit_comparable"
+    assert normalized.match_type == "same_product_different_pack"
+    assert normalized.price_basis == "unit_price"
+    assert "count_conflict" in normalized.reasons
+    assert "pack_quantity_difference" in normalized.reasons
+    assert unit_price["comparable"] is True
+    assert unit_price["unit_label"] == "張"
+    assert unit_price["momo_total_quantity"] == 168
+    assert unit_price["competitor_total_quantity"] == 42
     assert rejected.hard_veto is True
     assert "count_conflict" in rejected.reasons
 

tests/test_pchome_same_item_reconciliation.py

@@ -117,7 +117,7 @@ def test_independent_verifier_promotes_exact_and_unit_candidates_but_rejects_con
     assert result["blocked_candidates"][0]["reasons"]
 
 
-def test_independent_verifier_promotes_exact_sheet_pack_and_blocks_wrong_count():
+def test_independent_verifier_prefers_exact_sheet_pack_over_unit_candidate():
     from services.pchome_growth_same_item_reconciliation import (
         verify_same_item_candidates,
     )
@@ -160,14 +160,63 @@ def test_independent_verifier_promotes_exact_sheet_pack_and_blocks_wrong_count()
     assert result["selected_candidate_count"] == 1
     assert result["verified_candidates"][0]["product_id"] == "M-GATSBY-42"
     assert result["verified_candidates"][0]["auto_compare_type"] == "total_price"
-    rejected = next(
-        item
-        for item in result["blocked_candidates"]
-        if item["source_product_id"] == "M-GATSBY-15"
+    assert result["verified_candidate_count"] == 2
+    assert result["blocked_candidate_count"] == 0
+
+    unit_result = verify_same_item_candidates(
+        [target],
+        [candidates[1]],
+        identity={
+            "trace_id": "trace-gatsby-unit",
+            "run_id": "run-gatsby-unit",
+            "work_item_id": "GROWTH-P0-001-B",
+        },
     )
-    assert rejected["hard_veto"] is True
-    assert rejected["search_term"] == "gatsby 潔面濕紙巾 42張"
-    assert "count_conflict" in rejected["reasons"]
+    assert unit_result["selected_candidate_count"] == 1
+    unit_candidate = unit_result["verified_candidates"][0]
+    assert unit_candidate["auto_compare_type"] == "unit_price"
+    assert unit_candidate["target_price_basis"] == "unit_price"
+    assert unit_candidate["target_unit_price_comparison"]["comparable"] is True
+    assert unit_candidate["target_unit_price_comparison"]["unit_label"] == "張"
+
+
+def test_independent_verifier_never_treats_outer_sheet_pack_as_exact_total_price():
+    from services.pchome_growth_same_item_reconciliation import (
+        verify_same_item_candidates,
+    )
+
+    target = _target(
+        "P-GATSBY-42",
+        "GATSBY 潔面濕紙巾超值包42張入",
+        199,
+        1,
+    )
+    result = verify_same_item_candidates(
+        [target],
+        [{
+            "product_id": "M-GATSBY-42-X4",
+            "name": "【GATSBY】潔面濕紙巾超值包42張入*4包(4款任選)",
+            "price": 495,
+            "target_pchome_product_id": "P-GATSBY-42",
+            "target_search_term": "gatsby 潔面濕紙巾 42張",
+            "auto_compare_type": "total_price",
+        }],
+        identity={
+            "trace_id": "trace-gatsby-outer-pack",
+            "run_id": "run-gatsby-outer-pack",
+            "work_item_id": "GROWTH-P0-001-B",
+        },
+    )
+
+    assert result["selected_candidate_count"] == 1
+    candidate = result["verified_candidates"][0]
+    assert candidate["auto_compare_type"] == "unit_price"
+    assert candidate["same_item_reconciliation"]["candidate_claim_drift"] is True
+    assert candidate["target_match_type"] == "same_product_different_pack"
+    assert candidate["target_price_basis"] == "unit_price"
+    assert candidate["target_unit_price_comparison"]["unit_label"] == "張"
+    assert candidate["target_unit_price_comparison"]["momo_total_quantity"] == 168
+    assert candidate["target_unit_price_comparison"]["competitor_total_quantity"] == 42
 
 
 def test_coverage_post_verifier_requires_exact_source_readback_and_reports_revenue_delta():