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runAction sends base_version equal to view.version, but view was only updated from HTTP responses (create/action/refresh), never the SSE stream. While the engine auto-advances (diagnose to await_verify) the held version stayed frozen at create time, so the next action base_version CAS returned 409 conflict. Reconcile view from snapshot/state frames so its version tracks the session. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>