feat(mcp): add stdio host bridge for Lua MCP servers#27
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- Add ToolLister and PromptLister callback type aliases to Host - Update Host constructor to accept tool_lister and prompt_lister callbacks - Add private members to store lister callbacks - Implement Host::list_tools() to call tool_lister and format results - Implement Host::call_tool() with proper MCP result mapping - Implement Host::list_prompts() to call prompt_lister and format results - Implement Host::get_prompt() with error handling and message formatting - All methods now complete and ready for Lua bridge integration
… 2.3) - Create tool_lister lambda that calls Lua tool.names() and tool.specs() - Extract tool name, description, and parameters from Lua specs - Filter tools by name list if provided to host_stdio() - Create prompt_lister lambda that gets prompts from hosted_prompts map - Filter prompts by name list if provided to host_stdio() - Wire both callbacks to Host constructor - Add #include <set> for filtering support - Tool listing excludes remote MCP tools (only local tools and echo)
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Summary
yaaf.mcpAPIs for server hosting and authoring flowValidation
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