Suppress duplicate compaction and terminal wait events (#17601)

Addresses #17514

Problem: PR #16966 made the TUI render the deprecated context-compaction
notification, while v2 could also receive legacy unified-exec
interaction items alongside terminal-interaction notifications, causing
duplicate "Context compacted" and "Waited for background terminal"
messages.

Solution: Suppress deprecated context-compaction notifications and
legacy unified-exec interaction command items from the app-server v2
projection, and render canonical context-compaction items through the
existing TUI info-event path.

codex-rs/app-server/src/bespoke_event_handling.rs

@@ -1303,6 +1303,11 @@ pub(crate) async fn apply_bespoke_event_handling(
                 .await;
         }
         EventMsg::ContextCompacted(..) => {
+            // Core still fans out this deprecated event for legacy clients;
+            // v2 clients receive the canonical ContextCompaction item instead.
+            if matches!(api_version, ApiVersion::V2) {
+                return;
+            }
             let notification = ContextCompactedNotification {
                 thread_id: conversation_id.to_string(),
                 turn_id: event_turn_id.clone(),
@@ -1599,6 +1604,17 @@ pub(crate) async fn apply_bespoke_event_handling(
             .await;
         }
         EventMsg::ExecCommandBegin(exec_command_begin_event) => {
+            if matches!(api_version, ApiVersion::V2)
+                && matches!(
+                    exec_command_begin_event.source,
+                    codex_protocol::protocol::ExecCommandSource::UnifiedExecInteraction
+                )
+            {
+                // TerminalInteraction is the v2 surface for unified exec
+                // stdin/poll events. Suppress the legacy CommandExecution
+                // item so clients do not render the same wait twice.
+                return;
+            }
             let item_id = exec_command_begin_event.call_id.clone();
             let command_actions = exec_command_begin_event
                 .parsed_cmd
@@ -1702,6 +1718,17 @@ pub(crate) async fn apply_bespoke_event_handling(
                     .command_execution_started
                     .remove(&call_id);
             }
+            if matches!(api_version, ApiVersion::V2)
+                && matches!(
+                    exec_command_end_event.source,
+                    codex_protocol::protocol::ExecCommandSource::UnifiedExecInteraction
+                )
+            {
+                // The paired begin event is suppressed above; keep the
+                // completion out of v2 as well so no orphan legacy item is
+                // emitted for unified exec interactions.
+                return;
+            }
 
             let item = build_command_execution_end_item(&exec_command_end_event);
 

codex-rs/tui/src/chatwidget.rs

@@ -2193,6 +2193,7 @@ impl ChatWidget {
         self.request_redraw();
     }
 
+    #[cfg(test)]
     fn on_agent_message(&mut self, message: String) {
         self.finalize_completed_assistant_message(Some(&message));
     }
@@ -5924,7 +5925,7 @@ impl ChatWidget {
                 self.exit_review_mode_after_item();
             }
             ThreadItem::ContextCompaction { .. } => {
-                self.on_agent_message("Context compacted".to_owned());
+                self.on_context_compacted();
             }
             ThreadItem::HookPrompt { .. } => {}
             ThreadItem::CollabAgentToolCall {