changed user choice for TODO stale check

user can ignore, mark stale or quit.

crates/g3-core/src/lib.rs

@@ -4276,8 +4276,25 @@ impl<W: UiWriter> Agent<W> {
                                                     print!("\x07\x07\x07\x07\x07\x07");
                                                     let _ = std::io::stdout().flush();
                                                     
-                                                    if !self.ui_writer.prompt_user_yes_no("Requirements have changed! Continue?") {
-                                                        return Ok("❌ User aborted due to stale TODO list.".to_string());
+                                                    let options = ["Ignore and Continue", "Mark as Stale", "Quit Application"];
+                                                    let choice = self.ui_writer.prompt_user_choice("Requirements have changed! What would you like to do?", &options);
+                                                    
+                                                    match choice {
+                                                        0 => {
+                                                            // Ignore and Continue
+                                                            self.ui_writer.print_context_status("⚠️ Ignoring staleness warning.");
+                                                        }
+                                                        1 => {
+                                                            // Mark as Stale
+                                                            // We return a message to the agent so it knows to regenerate/fix it.
+                                                            return Ok("⚠️ TODO list is stale (requirements changed). Please regenerate the TODO list to match the new requirements.".to_string());
+                                                        }
+                                                        2 => {
+                                                            // Quit Application
+                                                            self.ui_writer.print_context_status("❌ Quitting application as requested.");
+                                                            std::process::exit(0);
+                                                        }
+                                                        _ => unreachable!(),
                                                     }
                                                 }
                                             }

crates/g3-core/src/ui_writer.rs

@@ -59,6 +59,10 @@ pub trait UiWriter: Send + Sync {
 
     /// Prompt the user for a yes/no confirmation
     fn prompt_user_yes_no(&self, message: &str) -> bool;
+
+    /// Prompt the user to choose from a list of options
+    /// Returns the index of the selected option
+    fn prompt_user_choice(&self, message: &str, options: &[&str]) -> usize;
 }
 
 /// A no-op implementation for when UI output is not needed
@@ -84,4 +88,5 @@ impl UiWriter for NullUiWriter {
     fn flush(&self) {}
     fn wants_full_output(&self) -> bool { false }
     fn prompt_user_yes_no(&self, _message: &str) -> bool { true }
+    fn prompt_user_choice(&self, _message: &str, _options: &[&str]) -> usize { 0 }
 }