Create CLI

Design CLI surface area: syntax, flags, output, error handling.

Conventions

• Long options preferred (--from not -f)
• stdout for data, stderr for progress/errors
• Exit codes: 0=success, 1=runtime error, 2=usage error
• Include --help, --json, --quiet
• Validate early, fail fast

Output

• Default: human-readable tables
• --json: JSON output (implies quiet)
• --quiet: suppress progress
• Respect NO_COLOR env