chore: checkpoint web Blender feature-gap work, docs and tests

- update native web_engine sources and rebuilt wasm artifacts
- add task cards, status notes and tooling scripts
- add web e2e specs, tutorial UI sources and tutorial assets
- sync golden task manifests and audit records

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

web/playwright.deployment-local.config.ts

@@ -0,0 +1,37 @@
+import { defineConfig, devices } from "@playwright/test";
+import { execFileSync } from "node:child_process";
+
+function resolveChromePath(): string | undefined {
+  if (process.env.CHROME_PATH) return process.env.CHROME_PATH;
+  try { return execFileSync("which", ["google-chrome"], { encoding: "utf8" }).trim() || undefined; }
+  catch { return undefined; }
+}
+
+const chromePath = resolveChromePath();
+const testPort = Number.parseInt(process.env.WEB_TEST_PORT ?? "5176", 10) || 5176;
+const testOrigin = `http://127.0.0.1:${testPort}`;
+
+export default defineConfig({
+  testDir: "tests/e2e",
+  timeout: 180_000,
+  expect: { timeout: 15_000 },
+  fullyParallel: false,
+  reporter: [["list"]],
+  use: {
+    baseURL: testOrigin,
+    ...devices["Desktop Chrome"],
+    headless: true,
+    screenshot: "only-on-failure",
+    trace: "retain-on-failure",
+    launchOptions: {
+      ...(chromePath ? { executablePath: chromePath } : {}),
+      args: ["--no-sandbox", "--use-gl=swiftshader", "--enable-unsafe-swiftshader", "--enable-unsafe-webgpu", "--enable-dawn-features=allow_unsafe_apis", "--use-webgpu-adapter=swiftshader"],
+    },
+  },
+  webServer: {
+    command: `BLENDER_WEB_HTTP_PORT=${testPort} node ../tools/web/deployment-http-server.mjs "${process.env.WBV2_CASE_APP ?? "dist"}"`,
+    url: testOrigin,
+    reuseExistingServer: false,
+    timeout: 30_000,
+  },
+});