fix(restart): deliver completion after channel reconnects (#4931)

tests/channels/test_napcat_channel.py

@@ -2,6 +2,7 @@ import asyncio
 
 import pytest
 
+from nanobot.bus.events import OutboundMessage
 from nanobot.bus.queue import MessageBus
 from nanobot.channels.napcat import NapcatChannel, NapcatConfig
 
@@ -52,6 +53,16 @@ def _channel(config: NapcatConfig | None = None) -> NapcatChannel:
     return NapcatChannel(config or NapcatConfig(allow_from=["*"]), MessageBus())
 
 
+@pytest.mark.asyncio
+async def test_send_raises_while_websocket_is_not_connected() -> None:
+    channel = _channel()
+
+    with pytest.raises(RuntimeError, match="not connected"):
+        await channel.send(
+            OutboundMessage(channel="napcat", chat_id="private:123", content="hello")
+        )
+
+
 @pytest.mark.asyncio
 async def test_group_message_requires_mention_by_default() -> None:
     channel = _channel(NapcatConfig(allow_from=["user1"], group_policy="mention"))