fix(headless): handle missing review preset gracefully instead of unwrap

src/headless.rs

@@ -149,7 +149,10 @@ pub fn run(config_or_task: &str, cwd_override: Option<&str>, name_override: Opti
 
 /// Review changes, auto-commit if no issues found.
 pub fn review() {
-    let configs = config::preset("review").unwrap();
+    let configs = match config::preset("review") {
+        Some(c) => c,
+        None => { eprintln!("preset 'review' not found"); return; }
+    };
     match execute_once(configs) {
         Ok(()) => {
             // Check if decision says "no issues" / "問題なし" / "コミット可能"