fix(tui/auto-upgrade): silence installer output and log completion

codex-rs/tui/src/chatwidget.rs

@@ -7197,9 +7197,10 @@ impl ChatWidget<'_> {
     }
 
     pub(crate) fn on_auto_upgrade_completed(&mut self, version: String) {
+        let notice = format!("Auto-upgraded to version {version}");
         self.latest_upgrade_version = None;
-        self.bottom_pane
-            .flash_footer_notice(format!("Upgraded to version {version}"));
+        self.push_background_tail(notice.clone());
+        self.bottom_pane.flash_footer_notice(notice);
         self.request_redraw();
     }
 

codex-rs/tui/src/updates.rs

@@ -298,6 +298,8 @@ async fn run_upgrade_command(command: Vec<String>) -> anyhow::Result<()> {
         cmd.args(&command[1..]);
     }
     cmd.stdin(Stdio::null());
+    cmd.stdout(Stdio::null());
+    cmd.stderr(Stdio::null());
 
     let status = cmd.status().await?;
     if !status.success() {