Introduce session-level state management for tools that need to maintain
state across conversation turns within the same session (UMO).
- Add ToolSessionManager class for central per-(UMO, tool_name) state
- Add ToolSessionState with set_persistent(key) support
- Add is_stateful flag to FunctionTool base class
- Wire session_manager through run_context in all agent runners
- Update ExecuteShellTool to use framework session manager
- Update CLAUDE.md with stateful tool documentation
BREAKING: Tools that were manually managing session state via _sessions
dict should migrate to use the framework's ToolSessionManager for proper
lifecycle management and persistence support.
- Lower default max_agent_step from 30 to 3 across all agent runners
(coze, dashscope, deerflow, dify) for faster responses
- Refactor ExecuteShellTool to use plumbum with session-based isolation,
maintaining shell state per session (cwd, env vars, etc.)
- Remove unused API-specific environment variables from cmd_run
- Fix data access bug in shipyard_neo._maybe_model_dump
- Add plumbum>=1.10.0 dependency
* feat: support anthropic skills
closes: #4687
* chore: ruff
* feat: implement skills management and selection in persona configuration
* feat: enhance skills management with local environment tools and permissions
