feat: Add gstack skills configuration to CLAUDE.md

Configure gstack skills for the team including /browse for web browsing,
/review, /ship, /qa, and other workflow skills.

CLAUDE.md

@@ -0,0 +1,21 @@
+# CLAUDE.md
+
+## gstack
+
+Use the `/browse` skill from gstack for all web browsing. Never use `mcp__Claude_in_Chrome__*` tools.
+
+### Available skills
+
+- `/plan-ceo-review` - CEO-perspective plan review
+- `/plan-eng-review` - Engineering plan review
+- `/plan-design-review` - Design plan review
+- `/design-consultation` - Design consultation
+- `/review` - Code review
+- `/ship` - Ship code
+- `/browse` - Web browsing (use this for all web browsing)
+- `/qa` - QA testing
+- `/qa-only` - QA testing only
+- `/qa-design-review` - QA design review
+- `/setup-browser-cookies` - Set up browser cookies
+- `/retro` - Retrospective
+- `/document-release` - Document a release