PCF4: Ministral Publication Confirmation Successor

Status: prospectively frozen on 2026-08-11 before PCF4 admission or compute.

PCF1, PCF2, and PCF3 remain closed with formal scientific result null. PCF3's infrastructure-only reference canary stopped before opening its source because the historical directory name product_reasoning triggered the post-freeze lexical firewall. It did not start the sandbox, publish data, submit a scientific graph, load a model, use an H100, or open an assessor.

PCF4 inherits every scientific and security clause of PCF1, PCF2, and PCF3. The host, source bytes/hashes, split, prompts, arms, seeds, training geometry, generated-candidate policy SHA-256 f27124db...f1e, trusted-reference sandbox mode, thresholds, single assessor open, and terminal gate are unchanged.

Its only repair is an exact control-plane exception already used by the main preparation job: the reference canary may read the one historical source file only when its complete SHA-256 equals 0b6d068b4d71f407cb234579b9278dc640df09139ea906dd0f52a6ab71e05398. No other product, public, or holdout path is admitted. The path is never exported to a GPU, model-visible artifact, prompt, candidate, or score.

Run the full infrastructure-only reference canary once. It must produce a fresh 40-probe sandbox receipt and pass every nonsealed frozen MBPP reference with zero holdout-reference access. If it passes, repackage the exact pushed runtime, replay storage/repository/model/source/live preflight, and submit one PCF4 graph. Disable requeue, retries, and automatic successors. Infrastructure failure, formal PASS, or formal FAIL ends PCF4. Do not open holdout, product, public, an alternate host, or a successor after PCF4.