fix: treat ctrl-c as curses cancel

hermes_cli/curses_ui.py

@@ -156,6 +156,8 @@ def curses_checklist(
         flush_stdin()
         return result_holder[0] if result_holder[0] is not None else cancel_returns
 
+    except KeyboardInterrupt:
+        return cancel_returns
     except Exception:
         return _numbered_fallback(title, items, selected, cancel_returns, status_fn)
 
@@ -278,6 +280,8 @@ def curses_radiolist(
         flush_stdin()
         return result_holder[0] if result_holder[0] is not None else cancel_returns
 
+    except KeyboardInterrupt:
+        return cancel_returns
     except Exception:
         return _radio_numbered_fallback(title, items, selected, cancel_returns)
 
@@ -401,6 +405,8 @@ def curses_single_select(
             return None
         return result_holder[0]
 
+    except KeyboardInterrupt:
+        return None
     except Exception:
         all_items = list(items) + [cancel_label]
         cancel_idx = len(items)

tests/hermes_cli/test_plugins_cmd.py

@@ -508,7 +508,7 @@ class TestPromptPluginEnvVars:
 
 
 class TestCursesRadiolist:
-    """Test the curses_radiolist function (non-TTY fallback path)."""
+    """Test the curses_radiolist function."""
 
     def test_non_tty_returns_default(self):
         from hermes_cli.curses_ui import curses_radiolist
@@ -524,6 +524,14 @@ class TestCursesRadiolist:
             result = curses_radiolist("Pick", ["x", "y"], selected=0, cancel_returns=1)
             assert result == 1
 
+    def test_keyboard_interrupt_returns_cancel_value(self):
+        from hermes_cli.curses_ui import curses_radiolist
+
+        with patch("sys.stdin") as mock_stdin, patch("curses.wrapper", side_effect=KeyboardInterrupt):
+            mock_stdin.isatty.return_value = True
+            result = curses_radiolist("Pick", ["x", "y"], selected=0, cancel_returns=-1)
+            assert result == -1
+
 
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