test: lock journey lifecycle and static fallback

tests/browser/reduced-motion.spec.ts

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+import { expect, test } from '../helpers/serve-dist';
+import {
+  environmentChunkPattern,
+  installSceneInstrumentation,
+  readSceneInstrumentation,
+} from '../helpers/scene-instrumentation';
+
+test.beforeEach(async ({ page }) => installSceneInstrumentation(page));
+
+test('boots reduced motion without requesting the live scene or automatic media', async ({ page, distUrl }) => {
+  const requests: string[] = [];
+  page.on('request', (request) => requests.push(request.url()));
+  await page.emulateMedia({ reducedMotion: 'reduce' });
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+
+  await expect(page.locator('.journey-poster')).toHaveCount(1);
+  await expect(page.locator('.journey-canvas')).toHaveCount(0);
+  await expect(page.locator('.journey-hud')).toBeVisible();
+  await expect(page.locator('nav[aria-label="Portfolio sections"]')).toBeVisible();
+  await expect(page.locator('#contact a[href^="mailto:"]')).toBeVisible();
+  await expect(page.getByRole('status')).toContainText('reduced motion requested');
+  expect(requests.some((url) => environmentChunkPattern.test(url))).toBe(false);
+  await expect(page.locator('video[src], video source[src]')).toHaveCount(0);
+  expect((await readSceneInstrumentation(page)).routeLabelsDrawn).toEqual([]);
+});
+
+test('requires explicit Enable motion after the system stops requesting reduction', async ({ page, distUrl }) => {
+  const requests: string[] = [];
+  page.on('request', (request) => requests.push(request.url()));
+  await page.emulateMedia({ reducedMotion: 'reduce' });
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+
+  await page.emulateMedia({ reducedMotion: 'no-preference' });
+
+  await expect(page.getByRole('button', { name: 'Enable motion' })).toBeVisible();
+  expect(requests.some((url) => environmentChunkPattern.test(url))).toBe(false);
+
+  await page.getByRole('button', { name: 'Enable motion' }).click();
+  await expect.poll(() => requests.some((url) => environmentChunkPattern.test(url))).toBe(true);
+});