Ralph Loop is a Hermes skill that turns any PRD (Product Requirements Document) into an autonomous, self-correcting build pipeline. It implements a "Ralph Wiggum Loop" -- the same high-level task is executed repeatedly against the current repository state until a strict verification condition is met (<RALPH_DONE>).
Key invariant: Progress lives 100% in files and git -- never in conversation context. Each iteration starts with fresh context, eliminating context rot on 100+ phase projects.