Check whether a LeadUp project is ready to deploy to leadup-server / Coolify. Verifies Docker build, env variable coverage, ports, Coolify config, GitHub branch, domain/subdomain, migrations, and a rollback plan, then outputs a READY / NOT READY verdict. Use when the user says "prepare deploy", "deploy checker", "make Docker work", "Coolify deploy", "leadup-server deploy", or "production ready".
