Auto-review pipeline for gstack

Runs several reviews of your plan in a row, covering product vision, design, engineering, and developer experience. It makes decisions for you using set principles, so you end up with a reviewed plan without answering every question.

Your agent shows you the skill and checks it before adding it. Text instructions only.

Heads up: Executes local scripts and PreToolUse hooks; telemetry and onboarding directives.