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Checkpoint — T2 FIX7 P0 Dry-Run + Execution-Readiness Independent Review (2026-06-11)

• Host: T2 / CLAUDE CODE / FABLE · Authority: REVIEW_NON_AUTHORITY
• Final status: T2_FIX7_P0_DRYRUN_EXECUTION_READINESS_REVIEW_PASS
• Codex: NO · Owner-ask: NO · Production mutation: NO · Implementation execution: NO · REAL_RUN/QT001/cutover: NO · Canonical fold: NO

What this was

Independent T2 review of T1's FIX7 P0 dry-run + rollback + execution-readiness packet, using TKT Base L0–L3 and Codex-style discipline (read governed bytes, recompute, adversarially probe). Determines readiness for an owner/operator decision on a future implementation-execution-no-production macro. Not production authority.

Verified (independent, from KB bytes)

• Authority seal: N7 efb0c574…1853d32, N8 daa70c39…6117e1a1, P7 9ddb27c3…034550 — all MATCH from source JSONs; cross-refs consistent; P7 implementation_authorized_by_p7_alone=false, boundary IMPLEMENTATION_EXECUTION_REMAINS_BLOCKED.
• Four trees recompute byte-exact: dry-run 02b200e5…94e6, planning f470d0d0…0fe8f, seal 3890cd34…2a234, bundle 1b824b91…ab26 — equal to macro values, packet_tree.sha256, and T1 capsule _external/.
• TKT Base L0–L3 PASS, ceiling L3, L4/5/6 deferred, no overclaim.
• Staging isolation: /tmp mktemp, 11/11 forbidden surfaces untouched.
• Rollback: PROVEN_IN_STAGING (RB-3 restored canon to P7 pin byte-exact); production rollback NOT_APPLICABLE — not overclaimed.
• Fail-closed: validator PASS on good data; T1 20/20 reproduced; T2 22/22 independent probes; tamper → exit 1, no PASS/seal token leak.
• Owner decision: default HOLD, NOT_AUTHORIZED, selected_option null, UNSIGNED.
• Overclaim scan: no PRODUCTION/SEMANTIC/IU/RELEASE PASS.

One finding (non-blocking)

T2-REC-ROLLBACK-HARDENING-1 — check_rollback_proof does not require after_apply_hash != before_hash (vacuous/idempotent mutation would pass). Not a defect in T1's evidence (RB-3 apply hash is genuinely distinct); admits no overclaim. Recommend folding the check into the validator before the execution macro.

Anti-duplication

No duplicate packet created. T2 produced only the 6 review-only deliverables (review report md+json, bad-input probes md+json, this checkpoint, current-state) + governance addendum. Resolution: REVIEW_NOTE_ONLY. Deletion performed: NO.

Objects

Reserved TKT-OBJ-418..429 (standalone governance addendum, above ceiling 417, APPLY_NOW=NO, no canonical fold). Canonical registry JSON rev20 / 00-index rev114 untouched.

NEXT

Owner/operator picks the post-dry-run decision (default HOLD). If AUTHORIZE_IMPLEMENTATION_EXECUTION_NO_PRODUCTION: separately-authorized KB/governance-only execution macro after OPT-4 + production scoping; REAL_RUN/QT001/cutover each still separate. Optionally route Codex re-review at the local capsule (FIX7-P0-CODEX-REVIEW-ROUTE-1) — runtime-only, does not block the owner decision.