fix(agent-runner): validate clean marketplace onboarding

skills/scripts/e2e/prepare-isolated-langbot-config.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+from __future__ import annotations
+
+import argparse
+import sys
+from pathlib import Path
+
+import yaml
+
+
+PROJECT_ROOT = Path(__file__).resolve().parents[3]
+sys.path.insert(0, str(PROJECT_ROOT))
+
+from tests.e2e.utils.config_factory import (  # noqa: E402
+    create_minimal_config,
+    create_test_directories,
+)
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--instance-root', required=True, type=Path)
+    parser.add_argument('--port', required=True, type=int)
+    parser.add_argument('--plugin-debug-port', required=True, type=int)
+    args = parser.parse_args()
+
+    config_path = create_minimal_config(args.instance_root, port=args.port)
+    create_test_directories(args.instance_root)
+
+    with config_path.open('r', encoding='utf-8') as file:
+        config = yaml.safe_load(file)
+
+    config['plugin']['enable'] = True
+    config['plugin']['enable_marketplace'] = True
+    config['plugin']['display_plugin_debug_url'] = (
+        f'ws://127.0.0.1:{args.plugin_debug_port}/plugin/debug/ws'
+    )
+
+    with config_path.open('w', encoding='utf-8') as file:
+        yaml.safe_dump(config, file, allow_unicode=True, sort_keys=False)
+
+
+if __name__ == '__main__':
+    main()