R12 Post-Commit Packet Transport V2 Result

Decision: POST-COMMIT CANONICAL NO-GO. The run from scientific commit a9c1f53 passed its internal 33 gates and exact algebra, but an independent adversarial audit found that the verifier accepts forged invocation evidence, the role processes are not OS-confined from parent paths, and the deterministic manifest-derived challenge is predictable before phase one. The artifact is preserved byte-for-byte under a rejected filename and has no standing as a v2 protocol pass. No neural fit is authorized.

1. Precommit canary custody

The superseded canary is retained locally as artifacts/r12/post_commit_packet_transport_v2_precommit_canary.json so the failed custody sequence remains auditable. Its former canonical-path hashes were:

file SHA-256:    908a6ff7039360dad72a7e571ecb6c25797709b8ac55e247d8decfdfbc895b42
payload SHA-256: f8e740faa413f7aa511b8dc3642dd78469b8d8452226235cd4cf6a65ca011ed0
recorded code:   efde07cf7a6179adb147a9f448086d219b9a496e685c9135cbf4c9321a20fa18

These values are engineering evidence only. They must not be cited as a v2 pass.

2. Independent review findings

Two precommit reviews returned REVISE BEFORE COMMIT because the canary or first repair:

1. was not bound to the reviewed implementation;
2. streamed packet bytes in memory instead of invoking file-to-file updaters;
3. compared parsed symbols rather than canonical bytes;
4. skipped all events in the stale-packet control instead of exactly one;
5. gave a special horizon reader an explicit depth field;
6. sampled derangements rather than uniform nonidentity permutations; and
7. asserted phase order without a measured manifest-to-challenge binding;
8. left packet history visible in shared updater/reader directories;
9. loaded the canonical challenge seed into the same executable as every role;
10. did not make a second complete run a prerequisite for pass;
11. allowed incomplete top-level and gate schemas through report verification; and
12. derived cell and process expectations from observed results rather than a frozen five-public/15-decisive layout;
13. retained only the first run's subprocess evidence after replay;
14. still allowed evidence-empty reports with fabricated true gates; and
15. defined the canonical challenge seed before the phase-one commitment.
16. reread temporary phase-one packet paths while assembling the seed- independence gate after the temporary directory had already been removed.

The scientific harness now fails closed on committed source identity, moves packet state only through immutable files, uses the canonical reader interface for the bounded-horizon control, performs canonical byte-row scoring, and records a read-only phase-two manifest bound to the phase-one manifest, uses a physically separate seed-free role executable, gives every updater and reader a one-packet invocation directory, gates the exact frozen cell/process layout, requires the exact report schema, and performs two full byte-identical core runs before pass can become true. The final artifact embeds the entire second core report, the verifier independently replays result layouts, scores, role cardinalities, manifest hashes, and post-commit seed derivation, and no numeric canonical seed exists before the phase-one manifest is frozen.

The defect-16 repair compares the replayed writer payload hashes directly to the immutable phase-one manifest hashes. A cleanup regression proves the gate still works after the packet paths no longer exist and rejects a mutated replay payload. The corrected local suite passes 13/13 tests. Because the scientific implementation and test changed, another clean commit is required before the next canonical attempt.

3. Rejected post-commit artifact

scientific commit: a9c1f53c275927ef7955d9578b3f1e493a460426
preserved path:    artifacts/r12/post_commit_packet_transport_v2_postcommit_no_go_a9c1f53.json
artifact mode:     0444
artifact bytes:    892632
file MD5:          f7502dc0824bff212d4ffe1ebfa4e161
file SHA-256:      4f63123028fe33717981d026ca4accc854943400a502e56698ff040145a2ab0d
payload SHA-256:   9fa2a1fef402f4751a115f4597ff113f764b0654e19fc608bf93a64d2a2f3c59
embedded replay:   byte-identical, 337 role records per core
internal verifier: PASS, 33/33 asserted gates
independent audit: NO-GO

The five public cells are state/motor 83,521/83,521. Every one of the 15 decisive cells is state 83,521/83,521 versus rank-two motor 4,913/83,521. The bounded horizon arm is exact through depth eight and falls to 4,913/83,521 at depth nine. These counts validate the inspected algebra only.

4. Independent audit NO-GO

The audit adds four claim-blocking defects:

17. verify_report can accept an evidence-forged report after the attacker mutates invocation exit codes, directory listings, hashes, or permutations and consistently recomputes the self-hashes and embedded replay;
18. fresh role directories are process-local conventions, not OS filesystem isolation, because a role can traverse parent directories containing phase-one packets and challenges;
19. the challenge seed is deterministic from committed source and the deterministic phase-one manifest, so it supplies ordering but no post- phase-one unpredictability against a precomputed finite table; and
20. the completed artifact/result custody had not yet been anchored in Git.

Defect 20 is closed by this hash-bound rejection record; it does not rescue the protocol. A v3-quality repair must use an OS sandbox that denies every role access outside its executable and declared files, a parent-generated random nonce committed only after phase one, and a separately implemented verifier that recomputes every transport chain, score, witness, and invocation record rather than trusting self-attested booleans. The corrected artifact hash and completed result record must then be committed and independently audited.

No neural fit, Shohin adapter, SFT, H100 job, workspace claim, or reasoning claim is authorized by this rejected result.