fix: align optional dependency contracts (#4907)

* fix: align optional dependency contracts

* ci: avoid duplicate test suite

* test: drop removed langsmith assertions

* test: rely on generic extra coverage

* test: restore existing plugin coverage

tests/channels/test_feishu_reaction.py

@@ -4,6 +4,8 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
+pytest.importorskip("lark_oapi")
+
 from nanobot.bus.queue import MessageBus
 from nanobot.channels.feishu import FeishuChannel, FeishuConfig, _FeishuStreamBuf
 

tests/channels/test_feishu_streaming.py

@@ -5,6 +5,8 @@ from unittest.mock import MagicMock
 
 import pytest
 
+pytest.importorskip("lark_oapi")
+
 from nanobot.bus.events import OutboundMessage
 from nanobot.bus.outbound_events import ProgressEvent
 from nanobot.bus.queue import MessageBus