Add full source parity validation workflow

tools/web/create-offline-release.mjs

@@ -40,6 +40,8 @@ fs.writeFileSync(path.join(bundle, "SOURCE_OFFER.txt"), [
   "Corresponding source for this GPL-2.0-or-later WebEngine distribution is provided in",
   "blender-web-corresponding-source.tar.gz alongside this archive. It contains the Blender 5.2",
   "source, Web application/protocol source, Web build scripts, dependency lockfile and build documentation.",
+  "The bundled ffmpeg.wasm runtime source is included as the content-addressed upstream archive",
+  "third_party/ffmpeg.wasm-source-f876f907c7e9b9bf51d4ed0b913a855a63ae63fc.tar.gz.",
   "The source archive is covered by SHA256SUMS.txt.",
   "",
 ].join("\n"));
@@ -105,6 +107,7 @@ deterministicArchive(binaryArchive, releaseRoot, ["blender-web-offline"]);
 const sourceArchive = path.join(releaseRoot, "blender-web-corresponding-source.tar.gz");
 const sourceEntries = [
   "blender-5.2.0",
+  "third_party/ffmpeg.wasm-source-f876f907c7e9b9bf51d4ed0b913a855a63ae63fc.tar.gz",
   "web/app",
   "web/protocol",
   "web/package.json",