Machine-readable output format

A CLI without --json output is a CLI that cannot be scripted. Users pipe your tool into jq, feed it into CI, wrap it in Makefile recipes, and compose it with other tools — and all of that requires structured, decoration-free output on stdout. When mytool list prints a pretty table with emoji dividers, the user has to write a regex parser in bash to extract one field. They will not. They will switch tools. Mixing status messages into JSON output (Loading...\n{...}) is worse — it silently breaks | jq without any error.

Add a --json flag to every command that produces data, write JSON to stdout with no prefix or decoration, and route status/progress to stderr. Example in src/cli/commands/list.ts:

if (opts.json) {
  process.stdout.write(JSON.stringify(items) + '\n')
} else {
  console.log(formatTable(items))
}

Confirm with mytool list --json | jq ..