Migrate comparison bundles to v2

internal/comparison/comparison_test.go

@@ -118,7 +118,7 @@ func TestManifestEncodingAndRoundTrip(t *testing.T) {
 		t.Fatalf("EncodeManifest() error = %v", err)
 	}
 	want := "{\n" +
-		"  \"schemaVersion\": \"weatherreporter.comparison.v1\",\n" +
+		"  \"schemaVersion\": \"weatherreporter.comparison.v2\",\n" +
 		"  \"comparisonId\": \"comparison_daily-2026-08-24\",\n" +
 		"  \"startedAt\": \"2026-08-24T12:00:00Z\",\n" +
 		"  \"finishedAt\": \"2026-08-24T12:01:00Z\",\n" +
@@ -146,6 +146,7 @@ func TestManifestEncodingAndRoundTrip(t *testing.T) {
 		"      \"modelName\": \"gpt-5-mini\",\n" +
 		"      \"status\": \"succeeded\",\n" +
 		"      \"validationStatus\": \"passed\",\n" +
+		"      \"repairAttempts\": 0,\n" +
 		"      \"reportPath\": \"01-weather-light.md\"\n" +
 		"    },\n" +
 		"    {\n" +
@@ -309,6 +310,7 @@ func validManifest() Manifest {
 				ModelName:        "gpt-5-mini",
 				Status:           StatusSucceeded,
 				ValidationStatus: "passed",
+				RepairAttempts:   intPtr(0),
 				ReportPath:       "01-weather-light.md",
 			},
 			{
@@ -321,3 +323,8 @@ func validManifest() Manifest {
 		},
 	}
 }
+
+func intPtr(value int) *int {
+	copy := value
+	return &copy
+}