feat: refine nightdrive world and authored car

Integrate the Blender grand tourer with a cohesive shader-driven road, terrain, atmosphere, lighting, and post-processing pass. Refine responsive drive dynamics and sign lifecycle behavior, and add durable visual, accessibility, and performance verification evidence.

tests/performance/budgets.test.ts

@@ -52,6 +52,7 @@ describe('release budgets', () => {
     expect(classifyArtifact('assets/index-a.css', '')).toBe('critical-css');
     expect(classifyArtifact('assets/index-a.js', 'import("./environment-b.js")')).toBe('initial-application-js');
     expect(classifyArtifact('assets/environment-b.js', 'three scene')).toBe('first-live-scene');
+    expect(classifyArtifact('assets/nightdrive-grand-tourer-a.glb', '')).toBe('first-live-scene');
     expect(classifyArtifact('assets/high-tier-b.js', 'optional bloom')).toBe('high-tier-extras');
     expect(() => classifyArtifact('assets/mystery.bin', '')).toThrow(/unclassified/u);
   });

tests/performance/drive-trace.spec.ts

@@ -179,9 +179,15 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
     "running",
     { timeout: 5_000 },
   );
-  await expect(page.locator(".journey-hud__quality")).toHaveText(
-    profile.tier === "high" ? "High" : "Low",
-  );
+  await expect
+    .poll(() =>
+      page.evaluate(
+        () =>
+          window.__PORTFOLIO_PERFORMANCE__?.snapshot().runtimeAllocation
+            ?.tier ?? null,
+      ),
+    )
+    .toBe(profile.tier);
   if (referenceRun !== null) {
     const observed = await page.evaluate(() => ({
       viewport: { width: innerWidth, height: innerHeight },
@@ -243,27 +249,16 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
   );
   await dispatchWheelBurst(page, cdp, at, 1_500, 100);
   await at(2_350);
-  await cdp.send("Input.dispatchKeyEvent", {
-    type: "keyDown",
-    key: "Tab",
-    code: "Tab",
-    windowsVirtualKeyCode: 9,
-  });
-  await at(2_370);
-  await cdp.send("Input.dispatchKeyEvent", {
-    type: "keyUp",
-    key: "Tab",
-    code: "Tab",
-    windowsVirtualKeyCode: 9,
-  });
-  await expect(
-    page.getByRole("slider", { name: "Sound volume" }),
-  ).toBeFocused();
+  await page.getByRole("button", { name: "Sound volume" }).click();
   await at(2_400);
+  const volumeSlider = page.getByRole("slider", { name: "Sound volume" });
+  await expect(volumeSlider).toBeVisible();
+  await volumeSlider.focus();
+  await expect(volumeSlider).toBeFocused();
   await page.evaluate(() =>
     window.__PORTFOLIO_PERFORMANCE__?.beginAction(
       "volume",
-      'input[aria-label="Sound volume"]',
+      'input[aria-label="Sound volume level"]',
     ),
   );
   await cdp.send("Input.dispatchKeyEvent", {
@@ -289,7 +284,7 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
     at,
     3_700,
     "mute",
-    'button:has-text("Mute sound")',
+    'button[aria-label="Mute sound"]',
   );
   await expect(
     page.getByRole("button", { name: "Unmute sound" }),
@@ -301,7 +296,7 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
     at,
     5_000,
     "unmute",
-    'button:has-text("Unmute sound")',
+    'button[aria-label="Unmute sound"]',
   );
   await dispatchWheelBurst(page, cdp, at, 5_400, 100);
   await dispatchPointerAction(
@@ -310,7 +305,7 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
     at,
     6_300,
     "pause",
-    'button:has-text("Pause motion")',
+    'button[aria-label="Pause motion"]',
   );
   await dispatchWheelBurst(page, cdp, at, 6_700, 100);
   await dispatchPointerAction(
@@ -319,7 +314,7 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
     at,
     7_600,
     "resume",
-    'button:has-text("Resume motion")',
+    'button[aria-label="Resume motion"]',
   );
   await dispatchWheelBurst(page, cdp, at, 8_000, 100);
   await at(8_800);
@@ -351,9 +346,6 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
 
   await expect(page).toHaveURL(/#contact$/u);
   await expect(page.locator("#contact > h2")).toBeFocused();
-  await expect(page.locator(".journey-hud__quality")).toHaveText(
-    profile.tier === "high" ? "High" : "Low",
-  );
   const snapshot = await page.evaluate(() =>
     window.__PORTFOLIO_PERFORMANCE__?.snapshot(),
   );
@@ -369,6 +361,7 @@ test("drive-trace.v1 runs on current Chromium with fail-closed reference authent
     throw new Error(
       "The production scene did not emit an actual allocation ledger.",
     );
+  expect(snapshot.runtimeAllocation.tier).toBe(profile.tier);
   const expectedPeriod = warmupMedian;
   const fcp = await page.evaluate(
     () =>