revert /name for now (#4978)

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

codex-rs/protocol/src/protocol.rs

@@ -171,11 +171,6 @@ pub enum Op {
     /// to generate a summary which will be returned as an AgentMessage event.
     Compact,
 
-    /// Set a human-friendly name for the current session.
-    /// The agent will persist this to the rollout as an event so that UIs can
-    /// surface it when listing sessions.
-    SetSessionName { name: String },
-
     /// Request a code review from the agent.
     Review { review_request: ReviewRequest },
 
@@ -463,9 +458,6 @@ pub enum EventMsg {
     /// Signaled when the model begins a new reasoning summary section (e.g., a new titled block).
     AgentReasoningSectionBreak(AgentReasoningSectionBreakEvent),
 
-    /// Session was given a human-friendly name by the user.
-    SessionRenamed(SessionRenamedEvent),
-
     /// Ack the client's configure message.
     SessionConfigured(SessionConfiguredEvent),
 
@@ -903,11 +895,6 @@ pub struct WebSearchEndEvent {
     pub query: String,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, TS)]
-pub struct SessionRenamedEvent {
-    pub name: String,
-}
-
 /// Response payload for `Op::GetHistory` containing the current session's
 /// in-memory transcript.
 #[derive(Debug, Clone, Deserialize, Serialize, TS)]