Document all CLI commands and options including:
- fabric tui, web, tail/logs, replay, prune, digest, config
- All options with defaults and descriptions
- OTLP receiver configuration
- Examples and common patterns
- Environment variables and exit codes
Resolves bd-6hm
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Bead-Id: bd-6hm
