11 Final Summary

Final: PASS. Stage 2.6A original FAILED; Stage 2.6A-FIX repairs the Plan/Tier/Signoff layer to be machine-enforced and auditable. No apply, no permit, no birth_registry write except KB report provenance.

Codex findings -> fix (all reproduced live, then fixed)

1. CASE tier hardcode -> builder rewritten to fn_qt001_machine_tier over predicate rule rows; interpreter is operator-only.
2. Descriptive tier registry -> executable predicate rows in qt001_tier_rule_registry.
3. Bad divergence drives Tier3 -> parity demoted to SIGNAL_ONLY; Tier3 is a fail-closed block, never apply authority.
4. Same literal blocked_reason -> fn_qt001_machine_blocked_reason per row (7 distinct live).
5. Signoff not plan-bound -> qt001_signoff_plan_binding requires current checksum + scope; plan_bound_safe=false.
6. Any review grants Tier1 -> TIER1 requires plan-bound positive validation; the 5 hard-listed collections correctly demote to TIER2; machine TIER1=0.
7. Hardcode guard false-pass -> hardcode_guard_v2 FAILs on dangerous/authority OPEN_NEXT_LAYER (HC-05).
8. Readiness false-green -> readiness v4 consumes machine rules; overall_ready=false, no literal route.
9. Writer public bypass -> inventory + must-block guard; writer fail-closed (0 permits); revoke deferred 2.6B.

Machine result (live, read-back)

TIER1=0, TIER2=7, TIER3=6; tier_rule_no_go_guard pass=true; blocked_reason 7 distinct / 0 empty; hardcode_guard_v2=FAIL; plan_bound_safe=false; readiness v4 BLOCKED; writer must-block pass=true; must_not_proceed pass=true.

Safety

birth 1,210,956 unchanged; qt001-origin 0; permits 0; ledgers 0; tga 129; apr 42; gateway c022f849 unchanged; stage0 5/5; rollback staged.

Completion contract

PASS: Codex 2.6A findings reproduced then fixed; tiering machine-enforced; signoff plan-bound; blocked reasons computed; hardcode guard fails on dangerous unresolved hardcode; readiness v4 blocked for the right reasons; writer remains blocked; no apply occurred.

Exact blocker to advance

Independent Codex re-audit of Stage 2.6A-FIX, then Stage 2.6B layers, then owner permit. Zero engineering blocker.