Phase 0: Discovery & Architecture Alignment
Repository audit, development environment provisioning, architecture consensus, and baseline telemetry instrumentation.
Sign-Off: Engineering leadership kickoff approved & environment operational.
Phase 1: Foundation & Alpha Pilot
Implement core domain abstractions, build initial microservices or agent workflows, and prove end-to-end integration.
Sign-Off: P95 latency targets met and 100% test pass rate on alpha features.
Phase 2: Velocity Scaling & Feature Delivery
Full-speed sprint execution, high-volume feature implementation, database refactoring, and AI agent augmentation.
Sign-Off: Sprint velocity sustained at >= 1.8x baseline with zero Sev-1 regressions.
Phase 3: Production Cutover & Handover
Final production migration, automated runbook documentation, knowledge transfer, and transition to long-term retainer.
Sign-Off: Zero open P0/P1 issues, all SLAs achieved, executive acceptance confirmed.