provision_ai_gateway.php and provision_mcp.php shared a prefix inside one
directory, which test_prefix_grouped_files rejects. Both move into
files/php/provision/ as ai_gateway.php and mcp.php, the layout
web-app-n8n already uses for its Python provisioning scripts.
The two lookups that feed the scripts to the container follow, and the
unit test moves to its mirrored path as provision/AiGatewayTest.php.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>