chore: checkpoint web Blender migration source, tools and docs

Accumulated uncommitted work: GHOST Web backend, WebGL/GPU web layer,
web workflow engine and protocol, tooling, docs and task records.
Large generated evidence, user-testing archives, build snapshots and
imported test assets remain untracked.

Co-Authored-By: Claude Code <noreply@anthropic.com>

web/tests/e2e/compositor-node-golden.spec.ts

@@ -78,4 +78,21 @@ test("M11-07 gives every allowlisted compositor node an independent CPU/WebGPU g
     expect(candidate.gpuSha256).toBe(expected.float32Sha256);
     expect(candidate.maxAbsoluteError).toBeLessThanOrEqual(golden.maxAbsoluteError);
   }
+  fs.mkdirSync(path.join(root, "tests/golden/WBV2-P1104-000"), { recursive: true });
+  fs.writeFileSync(
+    path.join(root, "tests/golden/WBV2-P1104-000/compositor-node-production.json"),
+    `${JSON.stringify({
+      schemaVersion: 1,
+      task: "WBV2-P1104-000",
+      operation: "COMPOSITOR_NODE_MAIN_CHROMIUM",
+      browser: "chromium",
+      queueMutation: false,
+      sourceNodes: {
+        "node:CompositorNodeRGB": "CONSTANT_COLOR",
+        "node:CompositorNodeExposure": "EXPOSURE",
+        "node:CompositorNodeInvert": "INVERT",
+      },
+      ...result,
+    }, null, 2)}\n`,
+  );
 });