fix(workflows): coerce gate prompt message to str before rendering

The multi-line render loop split the message on newlines, which assumes a
str. A non-string message (e.g. a YAML numeric literal) previously rendered
fine through the old f-string and would now raise on .split. Coerce with
str() to preserve that tolerance, and add a regression test.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: doquanghuy

src/specify_cli/workflows/steps/gate/__init__.py

@@ -106,7 +106,9 @@ def _prompt(message: str, options: list[str]) -> str:
         been folded in); each line is rendered inside the gate box.
         """
         print("\n  ┌─ Gate ─────────────────────────────────────")
-        for line in message.split("\n"):
+        # ``str(...)`` so a non-string message (e.g. a YAML numeric literal)
+        # renders rather than raising on ``.split``.
+        for line in str(message).split("\n"):
             print(f"  │ {line}" if line else "  │")
         print("  │")
         for i, opt in enumerate(options, 1):

tests/test_workflows.py

@@ -922,6 +922,22 @@ def test_read_show_file_invalid_path_does_not_raise(self):
         assert len(rendered) == 1
         assert rendered[0].startswith("(could not read file:")
 
+    def test_interactive_non_string_message_renders(self, monkeypatch, capsys):
+        from specify_cli.workflows.steps.gate import GateStep
+        from specify_cli.workflows.base import StepContext, StepStatus
+
+        # A YAML numeric literal reaches the prompt as a non-string; it must
+        # render rather than crash on the multi-line split.
+        monkeypatch.setattr("sys.stdin.isatty", lambda: True)
+        monkeypatch.setattr("builtins.input", lambda _prompt="": "1")
+
+        step = GateStep()
+        config = {"id": "review", "message": 123, "options": ["approve", "reject"]}
+        result = step.execute(config, StepContext())
+        out = capsys.readouterr().out
+        assert "123" in out
+        assert result.status == StepStatus.COMPLETED
+
     def test_templated_show_file_resolving_to_non_string_is_coerced(self):
         from specify_cli.workflows.steps.gate import GateStep
         from specify_cli.workflows.base import StepContext, StepStatus