Improve interruption UX.

ra_aid/tools/human.py

@@ -1,3 +1,4 @@
+import sys
 from langchain_core.tools import tool
 from prompt_toolkit import PromptSession
 from prompt_toolkit.key_binding import KeyBindings
@@ -16,6 +17,13 @@ def create_keybindings():
         """Trigger submission when Ctrl+D is pressed."""
         event.current_buffer.validate_and_handle()
 
+    @bindings.add('c-c')
+    def exit(event):
+        """Trigger exit when Ctrl+C is pressed."""
+        print()
+        print(" 👋 Bye!")
+        sys.exit(0)
+
     return bindings
 
 @tool