Verification ladder by epic

The behavioral work queue, derived from docs/audits/derived/_state.json (the one register, ADR-0067).G3 present = artifacts exist (not "done"). G4 behavior = a runnable scenario passes (the real proof). G5 live = a live-store workflow exists (presence, not pass-state). Rows are ordered by what to do next: RED behavioral gaps first, then G4 backlog (built but unproven). This is a different axis from GA readiness (10-gate, per-epic engineering readiness) — this ladder is per-acceptance-criterion functional verification, not epic quality-readiness. The two compose; neither replaces the other.