fix(session): un item.completed tardif n'efface plus le final agent_message Codex — #240

event_supersedes_pending_final ne fait plus annuler le final en attente par
tout événement autre que Heartbeat/RateLimited/turn-progress: seuls un progress
non-turn Started/Delta, un ToolActivity ou un Error annulent. Le buffering
agent_message survive ainsi jusqu'au flush a turn.completed (regréssion
codex_agent_message_survives_late_completed_item_as_final).

crates/infrastructure/src/session/codex.rs

@@ -699,17 +699,21 @@ impl CodexExecSession {
 }
 
 fn event_supersedes_pending_final(event: &ReplyEvent) -> bool {
-    !matches!(
-        event,
-        ReplyEvent::Heartbeat
-            | ReplyEvent::RateLimited { .. }
-            | ReplyEvent::Progress {
-                progress: ReplyProgress {
-                    kind: ReplyProgressKind::Turn,
-                    ..
-                }
-            }
-    )
+    match event {
+        ReplyEvent::Progress { progress } => {
+            progress.kind != ReplyProgressKind::Turn
+                && matches!(
+                    progress.stage,
+                    ReplyProgressStage::Started | ReplyProgressStage::Delta
+                )
+        }
+        ReplyEvent::ToolActivity { .. } | ReplyEvent::Error { .. } => true,
+        ReplyEvent::Final { .. }
+        | ReplyEvent::TextDelta { .. }
+        | ReplyEvent::Announcement { .. }
+        | ReplyEvent::Heartbeat
+        | ReplyEvent::RateLimited { .. } => false,
+    }
 }
 
 fn agent_message_progress_from_line(line: &str) -> Result<Option<ReplyEvent>, AgentSessionError> {