fix(cli): escape exception text in agents-list error handler (#465)

`jarvis agents list` crashed with a secondary Rich MarkupError when the
underlying exception message contained markup metacharacters like
`[...]`: the error handler did `console.print(f"[red]Error: {exc}[/red]")`,
and Rich re-parsed the interpolated message as markup (#297).

Escape the dynamic message with rich.markup.escape and keep only the
static "Error:" label styled, so the original error surfaces cleanly
instead of a traceback. Adds a regression test that reproduces the
MarkupError via an exception message with brackets.

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

src/openjarvis/cli/agent_cmd.py

@@ -88,7 +88,13 @@ def list_agents() -> None:
             )
         console.print(table)
     except Exception as exc:
-        console.print(f"[red]Error: {exc}[/red]")
+        # Escape the dynamic exception text: Rich re-parses console.print
+        # arguments as markup, so an exception message containing "[...]"
+        # raises a secondary MarkupError (see #297). Keep the static
+        # "Error:" label styled; render the message literally.
+        from rich.markup import escape
+
+        console.print(f"[red]Error:[/red] {escape(str(exc))}")
 
 
 @agent.command("create")

tests/cli/test_agent_cmd.py

@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+from unittest.mock import patch
+
 from click.testing import CliRunner
 
 from openjarvis.cli import cli
@@ -12,6 +14,25 @@ class TestAgentCmd:
         result = CliRunner().invoke(cli, ["agents", "list", "--help"])
         assert result.exit_code == 0
 
+    def test_agent_list_error_with_markup_chars_does_not_crash(self) -> None:
+        """Regression for #297.
+
+        When ``_get_manager()`` (or anything in the body) raises an
+        exception whose message contains Rich markup metacharacters like
+        ``[...]``, the error handler must not re-parse that text as markup
+        and blow up with a secondary MarkupError traceback. The command
+        should print a clean one-line error instead.
+        """
+        # A message with bracketed text is what triggers the MarkupError
+        # when fed to console.print() unescaped.
+        boom = RuntimeError("DB locked at [/var/run/x] not a [valid] tag")
+        with patch("openjarvis.cli.agent_cmd._get_manager", side_effect=boom):
+            result = CliRunner().invoke(cli, ["agents", "list"])
+        # No traceback / unhandled exception leaked through.
+        assert result.exception is None, result.output
+        # The raw message (brackets intact) is surfaced to the user.
+        assert "DB locked at [/var/run/x] not a [valid] tag" in result.output
+
     def test_agent_info_help(self) -> None:
         result = CliRunner().invoke(cli, ["agents", "info", "--help"])
         assert result.exit_code == 0