Portless - Named .localhost URLs

Replace port numbers with stable, named .localhost URLs for local development. For humans and agents.

Note: By default, use HTTP (http://myapp.localhost). Only enable HTTPS (--https or PORTLESS_HTTPS=1) if the user specifically requests it (e.g., for OAuth, secure cookies, or HTTPS-only features).

Why Portless?

Local dev with port numbers is fragile. Portless fixes that by giving each dev server a stable, named .localhost URL.