O3DE headless verify + editor automation

Verify O3DE rendering and automate the O3DE editor on Windows or Linux. Use when working on any O3DE project or gem and you need to: capture a rendered frame or video of a level (GameLauncher on the native GPU + ffmpeg, with Xvfb for a monitor-less Linux box); drive the editor programmatically (entity/component/asset wiring via editor Python or the o3de-mcp server); author asset references in prefab/level JSON…