refactor: remove unused imports and clean up code in various files

src/langbot/pkg/provider/runners/localagent.py

@@ -355,7 +355,6 @@ class LocalAgentRunner(runner.RequestRunner):
 
         if not is_stream:
             yield final_msg
-            initial_response_emitted = True
         elif not initial_response_emitted:
             yield final_msg
             initial_response_emitted = True

src/langbot/pkg/provider/tools/loaders/mcp.py

@@ -20,7 +20,7 @@ from ....core import app
 import langbot_plugin.api.entities.builtin.resource.tool as resource_tool
 import langbot_plugin.api.entities.builtin.provider.message as provider_message
 from ....entity.persistence import mcp as persistence_mcp
-from .mcp_stdio import BoxStdioSessionRuntime, MCPServerBoxConfig as MCPServerBoxConfig, MCPSessionErrorPhase
+from .mcp_stdio import BoxStdioSessionRuntime, MCPSessionErrorPhase
 
 
 class MCPSessionStatus(enum.Enum):

src/langbot/pkg/provider/tools/loaders/skill_authoring.py

@@ -275,7 +275,6 @@ class SkillToolLoader(loader.ToolLoader):
         # Build <available_skills> section
         available_skills_lines = ['<available_skills>']
         for skill_name, skill_data in sorted(skills.items()):
-            display_name = skill_data.get('display_name') or skill_name
             description = skill_data.get('description', '')
             available_skills_lines.append(f'<skill>')
             available_skills_lines.append(f'<name>{skill_name}</name>')

src/langbot/pkg/skill/activation.py

@@ -2,8 +2,6 @@ from __future__ import annotations
 
 import typing
 
-import langbot_plugin.api.entities.builtin.provider.message as provider_message
-
 from ..provider.tools.loaders import skill as skill_loader
 
 if typing.TYPE_CHECKING: