Served with isolation headers; start-screen capability notices; tests on the real GPU (t88 phase 1)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/t_dev_console.py

@@ -2,7 +2,8 @@
 import pathlib, sys
 sys.path.insert(0, str(pathlib.Path(__file__).resolve().parent.parent / 'tools'))
 from use_venv import ensure_playwright; ensure_playwright()
-from playwright.sync_api import sync_playwright
+from browser import launch, consume_gpu_option
+consume_gpu_option()
 
 ROOT = pathlib.Path(__file__).resolve().parent.parent
 SHOTS = ROOT / 'shots'
@@ -12,13 +13,11 @@ def check(name, ok):
     print(('PASS ' if ok else 'FAIL ') + name)
     if not ok: fails.append(name)
 
-with sync_playwright() as p:
-    browser = p.chromium.launch()
-    page = browser.new_page(viewport={'width': 1280, 'height': 760})
+with launch() as (browser, page, url):
     errors = []
     page.on('pageerror', lambda e: errors.append(str(e)))
     page.add_init_script("localStorage.setItem('deepgrain.settings', JSON.stringify({look:'pixel', sv:2}));")
-    page.goto((ROOT / 'dist/index.html').as_uri())
+    page.goto(url)
     page.wait_for_function("!$('title').hidden")
     page.evaluate("startNewWorld(424242, 512, 384, 'Console test')")
     page.wait_for_function('GAME.running && !GAME.loading')