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.
New tools: face_tracker, visual_qa, eye_enhance, auto_reframe, remotion_caption_burn, showcase_card, silence_cutter. Updated audio_mixer with segmented_music operation and subtitle_gen with ASR corrections. Registered TalkingHead composition in Root.tsx. Rewrote compose/edit/scene director skills for full enhancement chain, Remotion captions, multi-clip assembly, and visual QA. Gitignore cleanup: exclude test demo-props, downloaded music, and generated images.