gstack-review: Multi-Perspective Code Review

Review Framework

When asked to review code, follow this three-perspective framework. Run all steps systematically.

Step 0: Detect What to Review

Priority order for review scope:

1. Uncommitted changes (git diff HEAD) — if working directory is dirty
2. Specific files mentioned by user
3. Branch diff vs main — if on a feature branch
4. Recent commits — if no clear scope

# Check working tree status
git status --short