feat(import): upgrade release evidence for key families

scripts/import_phase2_data.go

@@ -93,9 +93,10 @@ var baiduModelMetadataRules = []baiduModelMetadata{
 	},
 	{
 		Prefix:         "baidu-ernie-5.1",
-		ModelSourceURL: "https://cloud.baidu.com/product/wenxinworkshop.html",
-		DateConfidence: "unknown",
-		DateSourceKind: "official_product_page",
+		ReleaseDate:    "2026-05-09",
+		ModelSourceURL: "https://ernie.baidu.com/blog/posts/ernie-5.1-0508-release/",
+		DateConfidence: "official_primary",
+		DateSourceKind: "official_announcement",
 	},
 	{
 		Prefix:         "baidu-ernie-4.5-turbo-vl",

scripts/import_phase2_data_test.go

@@ -103,7 +103,7 @@ func TestEnrichBaiduModelMetadataFallsBackToPricingSource(t *testing.T) {
 
 func TestEnrichBaiduModelMetadataSupportsSourceOnlyRules(t *testing.T) {
 	enriched := enrichBaiduModelMetadata(ModelPricing{
-		ModelID:   "baidu-ernie-5.1",
+		ModelID:   "baidu-ernie-4.5-turbo-vl",
 		SourceURL: "https://cloud.baidu.com/doc/qianfan/s/wmh4sv6ya",
 	})
 
@@ -118,6 +118,23 @@ func TestEnrichBaiduModelMetadataSupportsSourceOnlyRules(t *testing.T) {
 	}
 }
 
+func TestEnrichBaiduModelMetadataSupportsOfficialPrimaryRules(t *testing.T) {
+	enriched := enrichBaiduModelMetadata(ModelPricing{
+		ModelID:   "baidu-ernie-5.1",
+		SourceURL: "https://cloud.baidu.com/doc/qianfan/s/wmh4sv6ya",
+	})
+
+	if enriched.ReleaseDate != "2026-05-09" {
+		t.Fatalf("release date = %q, want %q", enriched.ReleaseDate, "2026-05-09")
+	}
+	if enriched.ModelSourceURL != "https://ernie.baidu.com/blog/posts/ernie-5.1-0508-release/" {
+		t.Fatalf("model source url = %q, want official announcement", enriched.ModelSourceURL)
+	}
+	if enriched.DateConfidence != "official_primary" || enriched.DateSourceKind != "official_announcement" {
+		t.Fatalf("unexpected official metadata: confidence=%q kind=%q", enriched.DateConfidence, enriched.DateSourceKind)
+	}
+}
+
 func TestEnrichBaiduModelMetadataSupportsCatalogBackfillRules(t *testing.T) {
 	enriched := enrichBaiduModelMetadata(ModelPricing{
 		ModelID:   "baidu-qianfan-vl-70b",

scripts/import_zhipu_data.go

@@ -140,8 +140,9 @@ var zhipuModelMetadataRules = []zhipuModelMetadata{
 	},
 	{
 		Prefix:         "glm-4-0520",
-		DateConfidence: "unknown",
-		DateSourceKind: "catalog_backfill",
+		ReleaseDate:    "2024-06-05",
+		DateConfidence: "secondary_authoritative",
+		DateSourceKind: "secondary_authoritative_report",
 	},
 	{
 		Prefix:         "glm-realtime",

scripts/import_zhipu_data_test.go

@@ -110,7 +110,7 @@ func TestEnrichZhipuModelMetadataSupportsCatalogBackfillRules(t *testing.T) {
 
 func TestEnrichZhipuModelMetadataSupportsLegacyCatalogBackfillRules(t *testing.T) {
 	enriched := enrichZhipuModelMetadata(ModelPricing{
-		ModelID:   "glm-4-0520",
+		ModelID:   "glm-4-long",
 		SourceURL: "https://open.bigmodel.cn/pricing",
 	})
 
@@ -122,6 +122,20 @@ func TestEnrichZhipuModelMetadataSupportsLegacyCatalogBackfillRules(t *testing.T
 	}
 }
 
+func TestEnrichZhipuModelMetadataSupportsSecondaryAuthoritativeLegacyRules(t *testing.T) {
+	enriched := enrichZhipuModelMetadata(ModelPricing{
+		ModelID:   "glm-4-0520",
+		SourceURL: "https://open.bigmodel.cn/pricing",
+	})
+
+	if enriched.ReleaseDate != "2024-06-05" {
+		t.Fatalf("release date = %q, want %q", enriched.ReleaseDate, "2024-06-05")
+	}
+	if enriched.DateConfidence != "secondary_authoritative" || enriched.DateSourceKind != "secondary_authoritative_report" {
+		t.Fatalf("unexpected legacy secondary metadata: confidence=%q kind=%q", enriched.DateConfidence, enriched.DateSourceKind)
+	}
+}
+
 func TestEnrichZhipuModelMetadataSupportsSecondaryAuthoritativeRules(t *testing.T) {
 	enriched := enrichZhipuModelMetadata(ModelPricing{
 		ModelID:   "glm-4-voice",