Make --id a positional argument for improved CLI usability

- Remove --id flags from all command argument structures
- Update RunArgs, StopArgs, TailArgs, CatArgs, StatusArgs to use positional ID
- Update all integration tests to use new positional argument syntax
- Update comprehensive LLM guide documentation with new command syntax
- Maintain -- separator support for complex commands
- More natural CLI interface: 'demon run web-server python -m http.server 8080'
- Consistent with common tools like docker, systemctl, git
- Breaking change but improves usability significantly
- All tests pass with new CLI format

Examples of new syntax:
- demon run web-server python -m http.server 8080
- demon stop web-server
- demon status web-server
- demon tail web-server --stdout
- demon cat web-server

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

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

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