Add llm command for comprehensive usage documentation

- Add 'demon llm' command that outputs detailed usage guide
- Comprehensive documentation targeted at LLM consumption
- Covers all commands with syntax, behavior, and examples
- Includes common workflows, best practices, and integration tips
- Explains file management, error handling, and scripting patterns
- Add test to verify LLM command output contains key sections

This provides a complete reference that other LLMs can use to understand
how to effectively use the demon CLI tool.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

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