revert /name for now (#4978)

There was a regression where we'd read entire rollout contents if there
was no /name present.

codex-rs/tui/src/app_event.rs

@@ -85,9 +85,6 @@ pub(crate) enum AppEvent {
     /// Open the custom prompt option from the review popup.
     OpenReviewCustomPrompt,
 
-    /// Begin setting a human-readable name for the current session.
-    SetSessionName(String),
-
     /// Open the approval popup.
     FullScreenApprovalRequest(ApprovalRequest),
 }