fix(027): stabilize shared acceptance gates and compatibility collateral

backend/src/api/routes/git.py

@@ -921,14 +921,23 @@ async def pull_changes(
     with belief_scope("pull_changes"):
         try:
             dashboard_id = _resolve_dashboard_id_from_ref(dashboard_ref, config_manager, env_id)
-            db_repo = db.query(GitRepository).filter(GitRepository.dashboard_id == dashboard_id).first()
+            db_repo = None
             config_url = None
             config_provider = None
-            if db_repo:
-                config_row = db.query(GitServerConfig).filter(GitServerConfig.id == db_repo.config_id).first()
-                if config_row:
-                    config_url = config_row.url
-                    config_provider = config_row.provider
+            try:
+                db_repo_candidate = db.query(GitRepository).filter(GitRepository.dashboard_id == dashboard_id).first()
+                if getattr(db_repo_candidate, "config_id", None):
+                    db_repo = db_repo_candidate
+                    config_row = db.query(GitServerConfig).filter(GitServerConfig.id == db_repo.config_id).first()
+                    if config_row:
+                        config_url = config_row.url
+                        config_provider = config_row.provider
+            except Exception as diagnostics_error:
+                logger.warning(
+                    "[pull_changes][Action] Failed to load repository binding diagnostics for dashboard %s: %s",
+                    dashboard_id,
+                    diagnostics_error,
+                )
             logger.info(
                 "[pull_changes][Action] Route diagnostics dashboard_ref=%s env_id=%s resolved_dashboard_id=%s "
                 "binding_exists=%s binding_local_path=%s binding_remote_url=%s binding_config_id=%s config_provider=%s config_url=%s",