Runtime observation: production T3 server, Codex stdio adapter, and Chromium web client.
Synthetic PNG fixtures and deterministic Codex notifications; no model service was called.
Both servers used fresh state; both turns completed.

BASE 95cb068c10a6cf0b33eed0a0cab3b298763fe852
Rendered image count: 1
Persisted assistant reply:
Image completion barrier reached. Expected below: CONTROL and FILE REFERENCE.

![](</synthetic/image-proof/control.png>)

Rejected notification warnings: 1
Dropped a Codex App Server notification that failed to decode
  operation: decode-notification-payload
  method: item/completed
  issueCount: 6
  issueKinds: [ 'Composite', 'Pointer', 'AnyOf', 'MissingKey' ]
  maximumPathDepth: 2

HEAD cc500421d5daac8dbbeaaf73d0f07015bd610cb7
Rendered image count: 2
Persisted assistant reply:
Image completion barrier reached. Expected below: CONTROL and FILE REFERENCE.

![](</synthetic/image-proof/control.png>)

![](</synthetic/image-proof/file-reference.png>)

Rejected notification warnings: 0