Stacked PRs

Break large features into small, reviewable PRs that depend on each other. Merge in order for clean history.

Quick Reference

main ──────────────────────────────────────────●
                                              /
PR #3 (final)  ─────────────────────────●────┘   ← Merge last
                                       /
PR #2 (middle) ────────────────────●──┘          ← Depends on #1
                                  /
PR #1 (base)   ────────────────●──                ← Merge first
                              /
feature/auth ──────●────●────●                    ← Development