[suggestion] introduce FaceRefiner for minimax h3

[faiezyacob]

This seems like a good improvement on face detail when generating video with minimax h3: https://github.com/Carasibana/ComfyUI-H3-FaceRefine

[BlackMixture]

Triage update: reviewed the current FaceRefine project and keeping this open as an experimental follow-up rather than adding it to the generation path now. It adds a face detector plus ultralytics, scipy, insightface, and optional scene-detection dependencies; it reruns H3 over tracked face crops; and its external-video preview route allows arbitrary local paths unless strict-path mode is explicitly enabled. A Mix Studio integration should require a pinned reviewed revision, strict paths by default, a licensed detector install path, representative quality and runtime benchmarks, and an optional post-process workflow so normal H3 generations remain unchanged.