feat(cloud-agent): support codex cloud runs#1644
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## Problem Cloud tasks running on the codex adapter don't display the user's message in the PostHog web UI log. codex-acp doesn't echo `session/prompt` back as a `session/update`, so the tapped stream persisted to S3 never sees a user turn and only the agent reply shows up. Regressed by #1644 (first time codex became a cloud adapter — Claude had always broadcast). ## Changes Mirror `ClaudeAcpAgent.broadcastUserMessage` in `CodexAcpAgent.prompt`: emit one `user_message_chunk` session update per prompt chunk before delegating to `codexConnection.prompt`. ## How did you test this? - New unit test in `codex-agent.test.ts` asserting `client.sessionUpdate` is called with `user_message_chunk` for each chunk before `codexConnection.prompt` resolves. - Full `@posthog/agent` suite green.
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Problem
cloud runs let users pick
codexvia the UI but the selected runtime was not carried through the cloud-run path consistentlyChanges
Companion: PostHog/posthog#54462