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>

tools/web/.probe61.mjs

@@ -0,0 +1,52 @@
+import { createRequire } from "node:module";
+import path from "node:path";
+const { chromium } = createRequire(import.meta.url)("/home/mes123456/workinf_Blender_Wasm/web/node_modules/playwright");
+const browser = await chromium.launch({ headless: true, executablePath: "/usr/bin/google-chrome-stable",
+  args: ["--no-sandbox","--use-gl=swiftshader","--enable-unsafe-swiftshader","--enable-unsafe-webgpu","--enable-dawn-features=allow_unsafe_apis","--use-webgpu-adapter=swiftshader"] });
+const ctx = await browser.newContext({ viewport: { width: 1440, height: 900 } });
+const page = await ctx.newPage();
+await page.addInitScript(() => {
+  const reg = []; window.__w = reg;
+  window.Worker = new Proxy(window.Worker, { construct(t, a) { const w = Reflect.construct(t, a); reg.push({ url: String(a[0]), worker: w }); return w; } });
+});
+await page.goto("http://127.0.0.1:5412/?ui=web", { waitUntil: "domcontentloaded" });
+await page.waitForFunction(() => document.body.innerText.includes("WASM ABI: ready"), undefined, { timeout: 120000 });
+await page.getByTestId("blend-file-input").setInputFiles("/home/mes123456/workinf_Blender_Wasm/tests/files/web/hierarchy_simplify_combined.blend");
+await page.waitForFunction(() => /SceneIR r\d+/.test(document.querySelector('[data-testid="engine-status"]')?.textContent ?? ""), undefined, { timeout: 120000 });
+await page.waitForTimeout(3500);
+const snap = () => page.evaluate(() => new Promise((resolve, reject) => {
+  const worker = window.__w.find(x => /web-engine\.worker/.test(x.url))?.worker;
+  const requestId = 'p-' + Math.random();
+  const timer = setTimeout(() => reject(new Error('timeout')), 30000);
+  const recv = ({ data }) => { if (data.requestId === requestId) { clearTimeout(timer); resolve(data); } };
+  worker.addEventListener('message', recv);
+  worker.postMessage({ requestId, command: { type: 'snapshot' } });
+}));
+const parents = async () => {
+  const r = await snap(); const s = r.result?.snapshot;
+  return { rev: s?.revision, p: Object.fromEntries((s?.nodes ?? []).map(n => [n.name, n.parentId ? s.nodes.find(x => x.id === n.parentId)?.name : null])) };
+};
+for (const name of ['Parts','Mount','RootRig']) {
+  const btn = page.getByRole('button', { name: `展开 ${name}`, exact: true }).first();
+  if (await btn.count()) { await btn.click(); await page.waitForTimeout(2200); }
+}
+console.log("BEFORE", JSON.stringify(await parents()));
+// Drop Payload onto empty container space with and without Shift.
+const drop = (name, shift) => page.evaluate(({ n, shiftKey }) => {
+  const row = [...document.querySelectorAll('[role="treeitem"]')].find(x => (x.getAttribute('aria-label')||'').trim() === n);
+  const tree = document.querySelector('.outliner-tree');
+  if (!row || !tree) return { error: 'missing', rows: [...document.querySelectorAll('[role=\"treeitem\"]')].map(x => (x.getAttribute('aria-label')||'').trim()).filter(Boolean) };
+  const dt = new DataTransfer();
+  row.dispatchEvent(new DragEvent('dragstart', { bubbles: true, cancelable: true, dataTransfer: dt }));
+  // target the container itself, not a row: dispatch directly on it
+  tree.dispatchEvent(new DragEvent('dragover', { bubbles: true, cancelable: true, dataTransfer: dt, shiftKey }));
+  const handled = !tree.dispatchEvent(new DragEvent('drop', { bubbles: true, cancelable: true, dataTransfer: dt, shiftKey }));
+  return { handled, payload: dt.getData('application/x-web-blender-objects') };
+}, { n: name, shiftKey: shift });
+console.log("DROP-NO-SHIFT", JSON.stringify(await drop('Payload', false)));
+await page.waitForTimeout(5000);
+console.log("AFTER-NO-SHIFT", JSON.stringify(await parents()));
+console.log("DROP-SHIFT", JSON.stringify(await drop('Payload', true)));
+await page.waitForTimeout(8000);
+console.log("AFTER-SHIFT", JSON.stringify(await parents()));
+await browser.close();