Phase 3: Gmail → Drive Pipeline (Milestone)
Phase 3 complete. The full Gmail → PDF → Drive pipeline runs end-to-end with a real Google account.
Sub-phases shipped: 3A (User identity + OAuth storage), 3B (Gmail client), 3C (Gotenberg PDF), 3D (Drive client + folder cache), 3E (Stage handlers), 3F (Scheduler + OAuth setup).
Next: Phase 1.5 (Hetzner k3s + multi-env CI/CD + first live deploy) and Phase 4 (live dashboard with B+D demo triggers).