CI run for upstream PR lidge-jun/opencodex#3917 - #1
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… destination `agent_message` is Codex's private multi-agent input item and exists only in the ChatGPT Codex backend's schema. Codex writes every sub-agent reply into the rollout, so it is replayed in the `input` of every later turn of that thread. A routed Responses destination answers the whole body with `422 unknown item type "agent_message"`, and 422 is a client error nothing fails over, so the thread stays broken until the history is dropped. The plaintext conversion already existed but was scoped to the OpenCode Go destination. Nothing about the rejection is destination-specific, so the conversion now applies to every destination with `authMode` other than "forward". Forward destinations keep the item unchanged, and genuine ciphertext and unknown part types keep their existing fail-closed path; the encrypted v2 task surface still owns those through `unreadable_encrypted_agent_task` and the opt-in recovery route. `isOpenCodeGo` existed only to scope this call and is removed with it. The helper and its tests move to destination-neutral names. Opaque-blob recovery repairs an undecryptable part into an omission marker, which leaves the item entirely plaintext; on a routed retry it is now converted too, which is what lets that retry be accepted at all. Fixes lidge-jun#3911
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Contributor-run cross-platform CI for lidge-jun#3917. Not for merge here.