a7e5f7498b
Add green_screen_processor (auto-detect + rembg fallback) and green_screen_composite (4 layout presets with alpha compositing) tools to automate the full keying-to-composite pipeline. Remotion: add AnimatedBackground with gradient mesh and floating orbs to Explainer, fix caption burn tool (remove entry point arg, auto-detect dimensions, extend TalkingHead duration to 300s). Update scene-director, compose-director, and asset-director skill docs with green screen workflow steps and component constraints.