Add CLAUDE.md so teammates pick up gstack

Documents the one-time install steps, the /browse-only browsing policy,
and lists the available gstack slash commands so a Claude Code session
in this repo has the convention loaded.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,59 @@
+# try-gstack
+
+Sandbox repo for trying out [gstack](https://github.com/garrytan/gstack) — a collection of slash-command skills for Claude Code.
+
+## gstack
+
+This project uses gstack. Teammates: install it once on your machine, then any Claude Code session in this repo will pick it up.
+
+### One-time install
+
+```sh
+git clone --single-branch --depth 1 https://github.com/garrytan/gstack.git ~/.claude/skills/gstack
+cd ~/.claude/skills/gstack && ./setup
+```
+
+`./setup` requires `bun` (`npm install -g bun` works) and a working Playwright Chromium (run `sudo npx playwright install-deps` if libs are missing on Linux).
+
+### Web browsing
+
+For **all** web browsing, use the `/browse` skill from gstack.
+
+**Never use `mcp__claude-in-chrome__*` tools.** `/browse` is the only sanctioned browser-control surface in this project.
+
+### Available gstack skills
+
+- `/office-hours`
+- `/plan-ceo-review`
+- `/plan-eng-review`
+- `/plan-design-review`
+- `/design-consultation`
+- `/design-shotgun`
+- `/design-html`
+- `/review`
+- `/ship`
+- `/land-and-deploy`
+- `/canary`
+- `/benchmark`
+- `/browse`
+- `/connect-chrome`
+- `/qa`
+- `/qa-only`
+- `/design-review`
+- `/setup-browser-cookies`
+- `/setup-deploy`
+- `/setup-gbrain`
+- `/retro`
+- `/investigate`
+- `/document-release`
+- `/codex`
+- `/cso`
+- `/autoplan`
+- `/plan-devex-review`
+- `/devex-review`
+- `/careful`
+- `/freeze`
+- `/guard`
+- `/unfreeze`
+- `/gstack-upgrade`
+- `/learn`