Tighten board API contracts (BindRequired, ArgumentException to 400, NotFound to 404), share terminal statuses, harden PATCH/create atomicity and vendor validation, restore migration discovery metadata, and cover remaining regression gaps.
Expose POST /api/workorders/board and POST /api/workorders/{id}/cancel for SHOC wizard/inline creation and soft cancel, with field locks, WO# normalization, and Admin-only hard delete.
Deliver PATCH board field updates and drop phases 3-7 code from the branch while keeping phase 0/1 dependencies required to build and test.