Checkpoint — FIX7 Recheck-9 R9-B1..R9-B5 Packet Hardening Lane (2026-06-10)

• Macro: FIX7_RECHECK9_PACKET_HARDENING_APPROVAL_LANE_MACRO_R9_B1_TO_R9_B5 · Executor: T1/Claude-Code/Mythos
• Final status: FIX7_RECHECK9_PACKET_HARDENED_SELF_CODEX_PASS
• Codex consulted: NO · Production PG/Directus/registry/system_issues mutation: NO · REAL_RUN/QT001/permit/activation/repoint/cutover: NO

Closure summary

blocker	verdict	decisive proof
R9-B1 verifier completeness	CLOSED	forbidden_operations_found=999 tamper: verify exit 1 + full RERUN exit 1 (V1: both 0, reproduced first)
R9-B2 produce fail-closed	CLOSED (P-EXT-2, SSOT rev2→rev3 49c386a9…b734d0, byte-exact apply proven)	missing doc 05: exit 4 + ALL digests SUPPRESSED_CORPUS_NOT_OK + frozen_ok False (V1: exit 0 + True); extra/invalid/absent-dir likewise; selftest 45/45
R9-B3 RERUN strictness	CLOSED	set -euo pipefail+trap; 10 live gates; 3 full-RERUN tamper tests exit 1; deterministic across runs
R9-B4 KB-native packet	CLOSED	19 files at KB packet root; divergent old copy deleted; KB-only reconstruction → tree 21752e19…480 identical → RERUN PASS
R9-B5 byte hash proof	PROVEN (MCP-byte level) + named residual	10 docs + SSOT independently hashed over MCP bytes, revision-bound, double-fetch deterministic; rev2 == 144eb3d9…412a verified; residual = no server-side digest endpoint (action-ready; does not block rerun)
adversarial suite	PASS 22/22	logs/adversarial-suite.log; runs inside every RERUN (gate 9)
Article 13	PASS	no local-mirror authority; governed KB surface reconstructs the runnable packet
Article 14	PASS	every PASS enforced by live execution; no prose PASS; no unverified load-bearing literal; fail-closed everywhere

Remaining (authority + named residual only)

N7 (sealed approval inputs, Codex/owner) · N8 (Codex-authored seal) · P7 (Codex re-seal over SSOT rev3) · OWN-1 (owner do-not-approve) · R9-B5-RES (server-side digest endpoint if Codex requires it).

Key artifacts

• Packet: knowledge/dev/laws/tool-kiem-thu/packets/fix7-codex-recheck-9-2026-06-10/ (19 docs; HASH_MANIFEST 28 entries; tree 21752e19c76f76613ba1680b734686c558a130e05d64dbc9eb5131b822fba480)
• SSOT: blueprint path rev3, candidate canonicalizer_sha256 = 49c386a9b9666c09786fc4f89bc79776b6046eaee6f4da6d8537d2c753b734d0; fence==extended .py d9caa9fe…f3e5; membership f2bda8…fe251
• Master report: knowledge/dev/laws/tool-kiem-thu/reports/fix7-recheck9-r9-b1-b5-hardening-master-report-2026-06-10.md (+6 sibling reports)
• Handoff: knowledge/dev/laws/tool-kiem-thu/checkpoints/fix7-codex-recheck-9-rerun-packet-v2-handoff-2026-06-10.md

Minimal safe next step

Route the V2 packet to Codex for a fresh Recheck-9 rerun/seal decision (N7/N8/P7 + authoritative values). No further T1 engineering is pending.