deploy
Stage 3 production deploy for substrate projects. Covers public *.vercel.app deploy, custom domain + 5 Clerk DNS CNAMEs + SSL, Clerk prod instance with domain-typo confirmation, prod Convex deployment, env sync via .env.prod, and optional GCP OAuth. Five phase markers (A–E) so you can stop or resume without redoing completed work. Invoke after /substrate:migrate once local sign-in is verified.