Network rate calculation requires two samples to compute the delta.
In JSON mode, the collector was only called once, causing the network
field to always return nil.
This change adds a second collection call with a 1-second interval,
allowing the network rates to be calculated properly.
Add --json command-line flag to mo status that outputs system metrics
in JSON format without requiring a TTY environment.
This enables:
- Integration with GUI applications (e.g., native macOS apps)
- Use in automation scripts and monitoring systems
- Piping output to tools like jq for data extraction
- Recording metrics for analysis
Implementation:
- Add JSON struct tags to all metric types
- Add --json flag using Go's flag package
- Implement runJSONMode() for one-time metric collection
- Refactor main() to support both TUI and JSON modes
- Maintain 100% backward compatibility (default TUI unchanged)
Testing:
- All 454 existing tests pass
- JSON output validated with jq and python json.tool
- Pipeline and redirection work correctly
- No breaking changes to existing functionality
When the terminal is stretched wide, the header info line may wrap to
multiple lines but the mole position was calculated independently based
on terminal width, causing vertical misalignment.
Separate header and mole rendering so mole always appears on dedicated
lines below the header regardless of terminal width.
