Initial implementation of demon CLI tool

Implement complete daemon process management CLI with the following features:
- demon run: spawn background processes with stdout/stderr redirection
- demon stop: graceful process termination with SIGTERM/SIGKILL timeout
- demon tail: real-time file watching and log tailing
- demon cat: display log file contents
- demon list: show all managed processes with status
- demon status: detailed process information
- demon clean: remove orphaned files from dead processes

Technical implementation:
- Uses clap for CLI with enum-based subcommands
- Structured logging with tracing crate
- File watching with notify crate for efficient tailing
- Process management with proper signal handling
- Creates .pid, .stdout, .stderr files in working directory
- Comprehensive error handling and edge case coverage

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

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

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