[family collaborator] tailor a CV while a collaborator continues editing the quarry — no data loss

Walk the cross-cutting story scenarios that span pipeline + collaboration: three actors converging after an extract, adding a column mid-score, switching the view group mid-drag, friend-edits during a tailor, the agent-tailors-while-user-offline path, mid-tailor section adds, and the no-workspace-delete safety. These specs catch races that single-actor suites cannot see.

Proof set for Tailor triggered while a friend is editing the source bullet — snapshot reflects tailor-time state