DRAFT READY: .spt/preserved/304-handoff/FAST-FOLLOW-PLAN-draft.md (570 words). Covers isolated v0.70.0 trace run, exact Q1/Q3 evidence boundaries, operator #302 probe, conditional seam B and same-gauge proof. Important prerequisite: refresh alone does not enter the Q3 trial; the plan requires a compatible admitted signed update/reapply that actually reaches AppliedPending, otherwise Q3 is blocked. No release-tree access/mutation in this task, no build/live observation/board mutation. Root-only traceable-reqs check passed: 903/903, zero findings.