- ToolSet.add() now protects active tools from inactive overrides
- Add missing _has_meaningful_content() method in RespondStage
- Remove is_local=True from ExecuteShellTool (no longer supported)
- Fix ToolSet() missing namespace argument in get_full_tool_set()
- Rewrite tests to match new tool architecture (cron_tools, func_tool_manager, tool_conflict_resolution)