fix(restart): show restart completion with elapsed time across channels

tests/channels/test_channel_plugins.py

@@ -13,6 +13,7 @@ from nanobot.bus.queue import MessageBus
 from nanobot.channels.base import BaseChannel
 from nanobot.channels.manager import ChannelManager
 from nanobot.config.schema import ChannelsConfig
+from nanobot.utils.restart import RestartNotice
 
 
 # ---------------------------------------------------------------------------
@@ -929,3 +930,30 @@ async def test_start_all_creates_dispatch_task():
     # Dispatch task should have been created
     assert mgr._dispatch_task is not None
 
+
+@pytest.mark.asyncio
+async def test_notify_restart_done_enqueues_outbound_message():
+    """Restart notice should schedule send_with_retry for target channel."""
+    fake_config = SimpleNamespace(
+        channels=ChannelsConfig(),
+        providers=SimpleNamespace(groq=SimpleNamespace(api_key="")),
+    )
+
+    mgr = ChannelManager.__new__(ChannelManager)
+    mgr.config = fake_config
+    mgr.bus = MessageBus()
+    mgr.channels = {"feishu": _StartableChannel(fake_config, mgr.bus)}
+    mgr._dispatch_task = None
+    mgr._send_with_retry = AsyncMock()
+
+    notice = RestartNotice(channel="feishu", chat_id="oc_123", started_at_raw="100.0")
+    with patch("nanobot.channels.manager.consume_restart_notice_from_env", return_value=notice):
+        mgr._notify_restart_done_if_needed()
+
+    await asyncio.sleep(0)
+    mgr._send_with_retry.assert_awaited_once()
+    sent_channel, sent_msg = mgr._send_with_retry.await_args.args
+    assert sent_channel is mgr.channels["feishu"]
+    assert sent_msg.channel == "feishu"
+    assert sent_msg.chat_id == "oc_123"
+    assert sent_msg.content.startswith("Restart completed")