Areas A to D (audit, policy side, loopd, bxctl) are written on branches in ~/src/boxmaker-ref-a to -d; area E (broker and approval handoff) is not started. HANDOFF.md records each area's result, the contract conflicts between them, the spec defects they found and the remaining steps in order. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>