Enable default status line indicators in TUI config (#12015)

Default statusline to something
<img width="307" height="83" alt="Screenshot 2026-02-17 at 18 16 12"
src="https://github.com/user-attachments/assets/44e16153-0aa2-4c1a-9b4a-02e2feb8b7f6"
/>

codex-rs/core/src/config/edit.rs

@@ -56,12 +56,6 @@ pub enum ConfigEdit {
 }
 
 pub fn status_line_items_edit(items: &[String]) -> ConfigEdit {
-    if items.is_empty() {
-        return ConfigEdit::ClearPath {
-            segments: vec!["tui".to_string(), "status_line".to_string()],
-        };
-    }
-
     let mut array = toml_edit::Array::new();
     for item in items {
         array.push(item.clone());

codex-rs/core/src/config/mod.rs

@@ -258,6 +258,9 @@ pub struct Config {
     pub tui_alternate_screen: AltScreenMode,
 
     /// Ordered list of status line item identifiers for the TUI.
+    ///
+    /// When unset, the TUI defaults to: `model-with-reasoning`, `context-remaining`, and
+    /// `current-dir`.
     pub tui_status_line: Option<Vec<String>>,
 
     /// The directory that should be treated as the current working directory

codex-rs/core/src/config/types.rs

@@ -619,6 +619,8 @@ pub struct Tui {
     /// Ordered list of status line item identifiers.
     ///
     /// When set, the TUI renders the selected items as the status line.
+    /// When unset, the TUI defaults to: `model-with-reasoning`, `context-remaining`, and
+    /// `current-dir`.
     #[serde(default)]
     pub status_line: Option<Vec<String>>,
 }