feat(chat): add multi-agent mode routing scaffold and telemetry.

surfsense_backend/app/agents/multi_agent_v1/entrypoint.py

@@ -0,0 +1,24 @@
+"""Multi-agent v1 entrypoint scaffold with safe fallback behavior."""
+
+from __future__ import annotations
+
+from collections.abc import AsyncGenerator, Callable
+from typing import Any
+
+
+class MultiAgentEntrypoint:
+    def stream_new_chat(
+        self,
+        *,
+        fallback_streamer: Callable[..., AsyncGenerator[str, None]],
+        fallback_kwargs: dict[str, Any],
+    ) -> AsyncGenerator[str, None]:
+        return fallback_streamer(**fallback_kwargs)
+
+    def stream_resume_chat(
+        self,
+        *,
+        fallback_streamer: Callable[..., AsyncGenerator[str, None]],
+        fallback_kwargs: dict[str, Any],
+    ) -> AsyncGenerator[str, None]:
+        return fallback_streamer(**fallback_kwargs)