Move all command-by-command reference (output formats, context
simulation, remote includes, cache/offline, component format, graph
modes, explain, project config, inline suppression, example output)
from README.md into a new USAGE.md. Replace the 326-line Usage section
in README with the commands block and a single link to USAGE.md.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
