Viewer frames render in long-lived Web Workers holding a project replica
(engine::remote: structural JSON diff/patch, Mirror, FrameServer); the
frame cache hands jobs to a RemoteFrames renderer (UI-thread fallback).
Roto Brush propagation runs in a job worker and streams segmentations
back (FrameSeg binary form), relayed to frame workers. Control-channel
wait:true commands whose job is offloaded reply when it ends. The Media
Browser browses a pluggable Browser: the file system on the desktop;
browser storage and File System Access folders on the web.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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