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/.probe56.mjs

@@ -0,0 +1,42 @@
+import { createRequire } from "node:module";
+import path from "node:path";
+const { chromium } = createRequire(import.meta.url)(path.resolve("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.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(path.resolve("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(3000);
+for (const name of ['Parts','Mount','RootRig']) {
+  const btn = page.getByRole('button', { name: `展开 ${name}`, exact: true }).first();
+  if (await btn.count()) { await btn.click(); await page.waitForTimeout(2200); }
+}
+// select Mount and KeyLight, then drag both onto NewParent
+await page.evaluate(() => {
+  const find = (n) => [...document.querySelectorAll('[role="treeitem"]')].find(x => (x.getAttribute('aria-label')||'').trim() === n);
+  find('Mount')?.querySelector('.tree-node-name')?.dispatchEvent(new MouseEvent('click', { bubbles: true }));
+});
+await page.waitForTimeout(2000);
+await page.evaluate(() => {
+  const find = (n) => [...document.querySelectorAll('[role="treeitem"]')].find(x => (x.getAttribute('aria-label')||'').trim() === n);
+  find('KeyLight')?.querySelector('.tree-node-name')?.dispatchEvent(new MouseEvent('click', { bubbles: true, ctrlKey: true }));
+});
+await page.waitForTimeout(2000);
+console.log("SELECTED", await page.evaluate(() => document.querySelector('main')?.getAttribute('data-selected-object-ids')));
+const drag = await page.evaluate(() => {
+  const find = (n) => [...document.querySelectorAll('[role="treeitem"]')].find(x => (x.getAttribute('aria-label')||'').trim() === n);
+  const src = [...document.querySelectorAll('[role="treeitem"]')].find(x => (x.getAttribute('aria-label')||'').trim() === 'Mount');
+  const dst = find('NewParent'); const dt = new DataTransfer();
+  src.dispatchEvent(new DragEvent('dragstart', { bubbles: true, cancelable: true, dataTransfer: dt }));
+  dst.dispatchEvent(new DragEvent('dragover', { bubbles: true, cancelable: true, dataTransfer: dt }));
+  dst.dispatchEvent(new DragEvent('drop', { bubbles: true, cancelable: true, dataTransfer: dt }));
+  return dt.getData('application/x-web-blender-objects');
+});
+console.log("PAYLOAD", drag);
+await page.waitForTimeout(9000);
+console.log("TREE", await page.evaluate(() => [...document.querySelectorAll('[role="treeitem"]')].map(n => `${n.getAttribute('aria-level')}:${(n.getAttribute('aria-label')||'').trim()}`).filter(x => !x.endsWith(':')).join(" | ")));
+console.log("ENGINE", await page.evaluate(() => document.querySelector('[data-testid="engine-status"]')?.textContent));
+await browser.close();