ignore deltas in codex_delegate (#6208)

ignore legacy deltas in codex-delegate to avoid this
[issue](https://github.com/openai/codex/pull/6202).

codex-rs/core/src/codex_delegate.rs

@@ -158,6 +158,11 @@ async fn forward_events(
 ) {
     while let Ok(event) = codex.next_event().await {
         match event {
+            // ignore all legacy delta events
+            Event {
+                id: _,
+                msg: EventMsg::AgentMessageDelta(_) | EventMsg::AgentReasoningDelta(_),
+            } => continue,
             Event {
                 id: _,
                 msg: EventMsg::SessionConfigured(_),

codex-rs/core/src/tasks/review.rs

@@ -10,8 +10,6 @@ use codex_protocol::protocol::Event;
 use codex_protocol::protocol::EventMsg;
 use codex_protocol::protocol::ExitedReviewModeEvent;
 use codex_protocol::protocol::ItemCompletedEvent;
-use codex_protocol::protocol::ReasoningContentDeltaEvent;
-use codex_protocol::protocol::ReasoningRawContentDeltaEvent;
 use codex_protocol::protocol::ReviewOutputEvent;
 use tokio_util::sync::CancellationToken;
 
@@ -124,9 +122,7 @@ async fn process_review_events(
                 ..
             })
             | EventMsg::AgentMessageDelta(AgentMessageDeltaEvent { .. })
-            | EventMsg::AgentMessageContentDelta(AgentMessageContentDeltaEvent { .. })
-            | EventMsg::ReasoningContentDelta(ReasoningContentDeltaEvent { .. })
-            | EventMsg::ReasoningRawContentDelta(ReasoningRawContentDeltaEvent { .. }) => {}
+            | EventMsg::AgentMessageContentDelta(AgentMessageContentDeltaEvent { .. }) => {}
             EventMsg::TaskComplete(task_complete) => {
                 // Parse review output from the last agent message (if present).
                 let out = task_complete