Checkpoint — Internal Proof (rev4 Phase-2 Readiness, no Codex)

Macro: PROGRAM_MACRO_CLOSE_PHASE2_OFFLINE_PACKET_MVP_READINESS_END_TO_END_2026_06_09. Date: 2026-06-09 · Final status: INTERNAL_PROOF_PARTIAL · Build-readiness decision: D — TRUE_BLOCKER (owner/operator + resource) · MVP implementation authorized: NO · Production mutation: NO · Codex consulted: NO. Minimal safe next step: owner/operator provisions the §12.1 deny-by-default sandbox host (M5) and disposes of B0‴ (route to Codex or owner-waive with documented risk). Then the offline MVP prototype build (next macro) becomes runnable.

Scope completed (READ-ONLY + design/report writes only)

Internally proved — from KB readback, rev4 evidence, and self-test design — whether Phase 2 can proceed to an offline packet MVP prototype build without another Codex review. DID NOT: implement the MVP, create executable tool code/runtime schema/runner/sandbox, install anything, mutate PG/Directus/registry/filesystem/system_issues, invoke FS-DOT/IU/detectors/scripts/shell/subprocess/FIX7, run any production command, perform a live read (the rev4 MVP performs none), or reopen sealed B/C/D/G/H. The only writes are the requested KB design/report/checkpoint documents.

What the proof established

Track 1 — KB readback: all 9 rev4 docs read from KB, mutually consistent, agree with the index → PASS. Critical clarification: the "Codex checkpoint packet rev4" is addressed to Codex and was never answered → no rev4 Codex seal exists; B0‴ is open.
Track 3 — Scope lock: 12/12 PASS. rev4 MVP is locked to offline/packet/non-gating/no-network/no-driver/no-live-query/no-KB-write/no-secret/no-arbitrary-local-FS/local-report-only/no-command/no-mutation/no-authority.
Track 4 — Codex blocker closure: PASS/PARTIAL. All 6 rev3 blockers mapped to a repair + named acceptance test; all answer "MVP still blocked = Yes"; deferrals (no-KB-writer; export side-effect-fn) named honestly. None resolved to the point of unblocking the build.
Track 5 — Guard requirements: 14/14 mapped to layer + impl requirement + test + proof-of-block. 10 are L1 (need the sandbox host).
Track 6 — Negative coverage: 16/16 classes; 15 in MVP, 1 (side-effect SELECT) honestly deferred (L5/B7).
Track 7 — Article 13: PASS (KB/PG-first; local-last; provenance-first packet; no live PG claim in MVP; this macro honored KB-first).
Track 8 — Article 14: PASS (preserved + strengthened; no prose-only PASS / no fake-green / execution claims forced NOT_PROVEN; FIX7 Recheck-8 caught at read level; this proof refuses to declare a fake-green Decision A).
JSON artifacts validated: the rev4 spec mirror and this proof's machine mirror both parse cleanly.

The decision (Track 9) and why

D — TRUE_BLOCKER (owner/operator + resource).

Not A (build now): "no authority decision remains" is false — B0‴ is a recorded precondition to any build and the offline-packet architecture is unreviewed; and the KB shows rev2/rev3 self-audits were each overturned by Codex → self-audit PASS ≠ build-ready. Plus a true resource blocker exists: the L1 sandbox host is specified, not deployed, and an un-sandboxed run fails closed to BLOCKED/exit 3 by its own P1 check.
Not B (rev5 repair): no design defect or wording gap found; a rev5 edit would not unblock (the blocker is resource + authority, not design).
Not C as primary: the user is reducing Codex dependency; the load-bearing, internally-unprovable blocker is the owner/operator sandbox host, not Codex; B0‴ is owner-waivable, so the immediate decision is the owner's (D). C is the path only if the owner chooses to honor B0‴.

Honest caveats (not defects)

The deny-by-default sandbox host is specified, not deployed — its provisioning (M5/B4′) is the load-bearing gate and is an owner/operator action.
B0‴ (Codex re-seal) is open; the offline-packet architecture is unreviewed by any independent authority; owner may honor or waive.
The live export step, bounded KB writer, gate-consumer, and execution surface are deferred (B7 / Call Contract).
MVP implementation remains UNAUTHORIZED. The proof makes the decision adjudicable by the owner; it does not grant the build.

Documents created/updated (this session)

reports/internal-evidence-proof-rev4-phase2-readiness-2026-06-09.md
reports/internal-evidence-proof-rev4-phase2-readiness-2026-06-09.json
checkpoints/action-ready-blockers-after-internal-proof-rev4-2026-06-09.md
checkpoints/checkpoint-internal-proof-rev4-phase2-readiness-2026-06-09.md (this file)
00-index.md (updated)

Build prompt packet intentionally NOT created (conditional on Decision A; decision is D).

Remaining blockers

B-EXT-1 (sandbox host provisioning — load-bearing, owner/operator) · B-EXT-2 (B0‴ rev4 Codex re-seal — owner honor/waive) · B-DEF-1..6 (deferred future-phase contracts: export step, KB writer, gate-consumer, Call/proof-of-run, selftest/manifest, positive-verdict authority). See checkpoints/action-ready-blockers-after-internal-proof-rev4-2026-06-09.md.

Read-back target

reports/internal-evidence-proof-rev4-phase2-readiness-2026-06-09.md (Tracks 1–12) and checkpoints/action-ready-blockers-after-internal-proof-rev4-2026-06-09.md.