chore: add gstack skill routing rules to CLAUDE.md

Per routing-injection preamble — once-per-project addition that lets
agents auto-invoke the right gstack skill instead of answering generically.

CLAUDE.md

@@ -683,3 +683,21 @@ The active skill lives at `~/.claude/skills/gstack/`. After making changes:
 Or copy the binaries directly:
 - `cp browse/dist/browse ~/.claude/skills/gstack/browse/dist/browse`
 - `cp design/dist/design ~/.claude/skills/gstack/design/dist/design`
+
+## Skill routing
+
+When the user's request matches an available skill, invoke it via the Skill tool. When in doubt, invoke the skill.
+
+Key routing rules:
+- Product ideas/brainstorming → invoke /office-hours
+- Strategy/scope → invoke /plan-ceo-review
+- Architecture → invoke /plan-eng-review
+- Design system/plan review → invoke /design-consultation or /plan-design-review
+- Full review pipeline → invoke /autoplan
+- Bugs/errors → invoke /investigate
+- QA/testing site behavior → invoke /qa or /qa-only
+- Code review/diff check → invoke /review
+- Visual polish → invoke /design-review
+- Ship/deploy/PR → invoke /ship or /land-and-deploy
+- Save progress → invoke /context-save
+- Resume context → invoke /context-restore