M13.10: web frame workers fed by project diffs, offloaded Roto Brush propagation, non-blocking wait jobs, browser Media Browser

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 <[email protected]>

apps/effectcraft-web/web/worker.js

@@ -1,7 +1,9 @@
-// An EffectCraft engine instance in a Web Worker: renders the Render Queue and runs analyses
-// off the page's thread (src/worker.rs, crates/engine/src/offload.rs). The page sends the
-// compiled module, then footage files and jobs; the worker replies with JSON messages and
-// rendered files.
+// An EffectCraft engine instance in a Web Worker (src/worker.rs, src/frames.rs,
+// crates/engine/src/offload.rs and remote.rs). The page sends the compiled module, then:
+// - job workers: footage files and jobs (Render Queue, analyses, Roto Brush); the worker replies
+//   with JSON messages and rendered files;
+// - frame workers: footage files and frame messages (project syncs as diffs, render requests,
+//   Roto Brush segmentations); the worker replies with frames (pixels transferred).
 import init, * as ec from "./effectcraft_web.js";
 
 let ready = null;
@@ -16,4 +18,5 @@ self.onmessage = async (e) => {
   await ready;
   if (m.type === "file") ec.workerFile(m.path, m.bytes);
   else if (m.type === "job") ec.workerJob(m.json);
+  else if (m.type === "frame") ec.workerFrame(m.json);
 };