- Implement `grokkit mcp` command to run as MCP server over stdio
- Export analysis, docs, and testgen functions for MCP tools
- Add tools: lint_code, analyze_code, generate_docs, generate_tests, generate_commit_msg, run_recipe
- Register resources: recipes://local, recipes://global, prompts://language
- Update README and add user guide for MCP
- Add MCP config options and dependencies
