BIRTH_GATEWAY_DESIGN_INDEX.md advanced to rev19. Status line: Stage 2.6A-FIX4 PARTIAL — authoritative path repointed to v4 family, no legacy dependency, ready for Codex re-audit; apply BLOCKED. Codex FIX3 verdict STAGE2_6A_FIX3_FAIL_HARDCODE_OR_BYPASS_STILL_DANGEROUS documented as superseded-by-fix-pending-reaudit. No 2.6B until Codex PASS of FIX4. New authoritative objects registered: fn_qt001_*_v4 family, fn_qt001_rule_governance_ok_v2, qt001_authority_identity_registry, qt001_evidence_registry, v_qt001_apply_readiness_guard_v7, v_qt001_hardcode_guard_v5, v_qt001_writer_no_legacy_dependency_guard, v_qt001_authoritative_path_dependency_map.