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/fixtures/native-compute-capture.ts

@@ -0,0 +1,12 @@
+import type { Worker } from '@playwright/test';
+export async function installNativeComputeCapture(worker: Worker) {
+  await worker.evaluate(() => {
+    const root = self as any, calls: any[] = []; root.__wbv2NativeComputeCapture = calls;
+    for(const transport of ['Worker','MessagePort']){const proto = (globalThis as any)[transport].prototype, original = proto.postMessage;
+      proto.postMessage = function(this: any, envelope: any, ...rest: any[]) { const message = envelope?.request ?? envelope; if(message?.job && message.control instanceof SharedArrayBuffer && message.data instanceof SharedArrayBuffer){calls.push({ transport, job: structuredClone(message.job), sizes: [...message.sizes], data: message.data.byteLength <= 2097152 ? Array.from(new Uint8Array(message.data)) : null, control: message.control, error: message.error });}else if(Array.isArray(message?.releaseOwners))calls.push({ transport, releaseOwners: [...message.releaseOwners] }); if(calls.length > 64){calls.shift(); root.__wbv2CaptureTruncated = true;} return Reflect.apply(original, this, [envelope, ...rest]); };
+    }
+  });
+}
+export async function readNativeComputeCapture(worker: Worker) {
+  return worker.evaluate(() => { if((self as any).__wbv2CaptureTruncated)throw new Error('Native compute capture budget exceeded'); return ((self as any).__wbv2NativeComputeCapture ?? []).map(({ control, error, ...snapshot }: any) => { if(!control)return snapshot; const flags = new Int32Array(control), bytes = new Uint8Array(error), length = Math.min(bytes.length, Math.max(0, Atomics.load(flags, 1))); return { ...snapshot, state: Atomics.load(flags, 0), diagnostic: new TextDecoder().decode(bytes.slice(0, length)) }; }); });
+}