Fix CI regressions and stabilize tests

internal/storage/sqlite/test_helpers.go

@@ -19,24 +19,30 @@ import (
 //   - For shared memory (not recommended): ":memory:"
 func newTestStore(t *testing.T, dbPath string) *SQLiteStorage {
 	t.Helper()
-	
+
 	// Default to temp file for test isolation
 	// File-based databases are more reliable than in-memory for connection pool scenarios
 	if dbPath == "" {
 		dbPath = t.TempDir() + "/test.db"
 	}
-	
+
 	store, err := New(dbPath)
 	if err != nil {
 		t.Fatalf("Failed to create test database: %v", err)
 	}
-	
+
+	t.Cleanup(func() {
+		if cerr := store.Close(); cerr != nil {
+			t.Fatalf("Failed to close test database: %v", cerr)
+		}
+	})
+
 	// CRITICAL (bd-166): Set issue_prefix to prevent "database not initialized" errors
 	ctx := context.Background()
 	if err := store.SetConfig(ctx, "issue_prefix", "bd"); err != nil {
 		_ = store.Close()
 		t.Fatalf("Failed to set issue_prefix: %v", err)
 	}
-	
+
 	return store
 }