aftabqamar1122/garrytan-gstack ? reverse-engineered prompt

Build me an open source toolkit called gstack that makes an AI coding assistant feel like a whole product team instead of one generic chat bot. I want simple slash style commands that help with product planning, engineering review, design feedback, QA in a real browser, security review, release notes, and shipping changes. The core experience should be easy to install, easy to add to a repo for a whole team, and mostly driven by readable markdown prompts and lightweight scripts.

Make it feel useful for founders, tech leads, and first time users. A good quick start would be something like office hours to talk through an idea, a CEO style review for scope, review for code changes, QA against a staging URL, and ship for release. It should support Claude Code first, and if practical also work with other coding agents and OpenClaw.

Please include setup, docs, team mode, upgrade flow, and examples so someone can just install it and start using it right away. Look up current docs online if you need to.