Docs only: the fusion_maintenance brief (+ Westin Step 0 / install-base sizing), the approved design spec (build into fusion_repairs; flat-fee per type; new-sale trigger + two-regime backfill; technician-aware booking on fusion_tasks), and Plan 1 (Foundation) + Plans 2-5 roadmap. Implementation pending. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>