PMP Practice: Update Documentation for Changes

Harper Okonkwo-Williams is managing a three-year infrastructure upgrade for Cardamom Circuit Games, a shipping company modernizing its warehouse management system across 47 distribution centers. The project follows a predictive approach with a detailed baseline approved by senior leadership and the board. Five months into execution, a major client requests integration with a new blockchain-based tracking platform. The sales director insists this change is critical for retaining the client, who represents 18% of company revenue. The technical lead estimates the integration would require 8 additional weeks and $340,000 in development costs. The project charter explicitly states that scope changes affecting the budget by more than $250,000 require board approval, but the sales director is pressuring Harper to begin work immediately, claiming 'agile teams would just add it to the backlog without all this bureaucracy.' What should Harper do?