robustness: vision/depth render off the event loop (deepcopy snapshot), chat auto-reconnect + friendly errors, demo catches connection failures

testbed/chat.py

@@ -191,12 +191,34 @@ async def chat_loop(client: AICCClient, manifest, args: argparse.Namespace) -> i
 
 
 async def run(args: argparse.Namespace) -> int:
-    transport = WebSocketClientTransport(args.url)
-    async with AICCClient(transport) as client:
-        manifest = await client.handshake()
-        print(f"[handshake] session {manifest.session_id} world {manifest.world.name}")
-        print(f"[handshake] tools: {[t.id for t in manifest.tools]}")
-        return await chat_loop(client, manifest, args)
+    """Run the chat session, reconnecting to the bridge if the connection dies."""
+    attempts = 0
+    while True:
+        try:
+            transport = WebSocketClientTransport(args.url)
+            async with AICCClient(transport) as client:
+                manifest = await client.handshake()
+                print(
+                    f"[handshake] session {manifest.session_id} world {manifest.world.name}"
+                )
+                print(f"[handshake] tools: {[t.id for t in manifest.tools]}")
+                return await chat_loop(client, manifest, args)
+        except asyncio.CancelledError:
+            raise
+        except KeyboardInterrupt:
+            raise
+        except Exception as exc:  # noqa: BLE001 - connection lost: reconnect
+            attempts += 1
+            print(f"\n[chat] connection lost ({type(exc).__name__}: {exc})")
+            if attempts >= 3:
+                print(
+                    "[chat] giving up after 3 attempts — is the bridge running? (scripts/run_bridge.sh)"
+                )
+                return 1
+            print(
+                "[chat] reconnecting in 2 seconds… (the room keeps its state on the bridge)"
+            )
+            await asyncio.sleep(2.0)
 
 
 def main() -> int: