chore: consolidate compaction token usage (#6894)

codex-rs/core/src/codex.rs

@@ -1085,11 +1085,14 @@ impl Session {
         self.send_token_count_event(turn_context).await;
     }
 
-    pub(crate) async fn override_last_token_usage_estimate(
-        &self,
-        turn_context: &TurnContext,
-        estimated_total_tokens: i64,
-    ) {
+    pub(crate) async fn recompute_token_usage(&self, turn_context: &TurnContext) {
+        let Some(estimated_total_tokens) = self
+            .clone_history()
+            .await
+            .estimate_token_count(turn_context)
+        else {
+            return;
+        };
         {
             let mut state = self.state.lock().await;
             let mut info = state.token_info().unwrap_or(TokenUsageInfo {