test(dashboard): gate WAL preservation check by runtime

Signed-off-by: joelbrilliant <joelbrilliant1@gmail.com>

tests/hermes_cli/test_web_server.py

@@ -258,6 +258,7 @@ class TestWebServerEndpoints:
         self.client = TestClient(app)
         self.client.headers[_SESSION_HEADER_NAME] = _SESSION_TOKEN
 
+    @pytest.mark.requires_wal
     def test_get_sessions_poll_preserves_pending_wal(self):
         """Repeated GET-only polls must not checkpoint another writer's WAL."""
         import sqlite3