feat(infra): pull artifacts pinned by package release

bot_bottle/gateway/__init__.py

@@ -115,10 +115,12 @@ class Gateway(abc.ABC):
 
     name: str
 
+    def ensure_available(self) -> None:
+        """Acquire the exact image/rootfs selected for this application."""
+        self.ensure_built()
+
     def ensure_built(self) -> None:
-        """Ensure the gateway's image / rootfs exists, building it if needed.
-        Default: nothing to build (e.g. a stub or a pre-pulled image). Call
-        before `connect_to_orchestrator`."""
+        """Local-build implementation hook retained for backend compatibility."""
         return
 
     @abc.abstractmethod