feat(scheduler,rotation,envelope,api,ui): pgqueuer jobs and deferred injects, master rotation with handout, vault envelope, jobs page

src/beaver_gateway/frontends/base.py

@@ -89,6 +89,7 @@ class GatewayRuntime:
     conversations: Any = None
     bus: Any = None
     pool: Any = None
+    scheduler: Any = None
     # External origin the reverse proxy puts in front of the gateway
     # (``Gateway.public_url``); ``None`` means "derive from the request".
     public_url: str | None = None
@@ -134,3 +135,7 @@ class Frontend(ABC):
 
     async def materialize(self, conv: Conversation) -> ConversationBinding | None:  # noqa: ARG002
         return None
+
+    async def mark_closed(self, conv: Conversation) -> bool:  # noqa: ARG002
+        """Show in the window that the conversation is over (a renamed topic)."""
+        return False