Before == after (committed): birth_registry 1,211,064 == 1,211,064 (delta 0); qt001-origin births 0; trigger_guard_alerts 129 == 129 (no trigger DDL); fn_birth_registry_auto unchanged, v_birth_gateway_contract_integrity_dashboard all_ok true; open execute permits 0; done ledgers 0; approval_requests approved 2; dangerous DOT freeze PASS 2/2. No event/REALRUN/UI mutation. PG16 OOM-safe (no full materialization added; guards are scalar/aggregate views). Rollback staged at 99_rollback.sql and rehearsed clean (restores v5/v2 bodies, rebuilds v2 plan, drops v4 objects/registries).

Change inventory: 2 new tables (qt001_evidence_registry, qt001_authority_identity_registry), 8 new functions (governance_ok_v2, signoff_row_valid_v4, machine_tier_v4, plan_fingerprint_v4, signoff_satisfies_v4, collection_signals_v4, eval_rule_v4 + wrapper repoint), 4 CREATE OR REPLACE repoints (writer, builder, machine_tier wrapper, machine_blocked_reason), ~21 new views, 1 plan rebuild (v2->v4 CURRENT, additive). Zero ALTER TABLE, zero CREATE TRIGGER, zero gateway/DOT change. Rehearsed BEGIN..ROLLBACK twice (incl. full apply->rollback reversibility) before COMMIT.