test(e2e): a page load the machine had no buffer for is tried again

net::ERR_NO_BUFFER_SPACE stopped a release at its first page with nothing else running, and the
unchanged rerun passed. Every page load of the suite now goes through one helper, held by a test.

frontend/e2e/speed.measure.ts

@@ -1,7 +1,7 @@
 import { test, type Page } from "@playwright/test";
 import { execFileSync } from "node:child_process";
 import { mkdirSync, writeFileSync } from "node:fs";
-import { retryConnect } from "./retryConnect";
+import { gotoRetrying, retryConnect } from "./retryConnect";
 
 /**
  * The speed baseline: numbers, not assertions — read by `scripts/audit_metrics.py --speed`, which
@@ -78,7 +78,7 @@ test("speed baseline", async ({ browser, page: page0 }) => {
   for (let i = 0; i < RUNS; i++) {
     const ctx = await browser.newContext();
     const page = await ctx.newPage();
-    await page.goto("/");
+    await gotoRetrying(page, "/");
     // Timed inside the page, every frame: an `expect` would read the clock on its own retry
     // schedule (100 ms … 1 s steps), not when the card appeared.
     const at = await page.waitForFunction(
@@ -108,7 +108,7 @@ test("speed baseline", async ({ browser, page: page0 }) => {
     for (let i = 0; i < RUNS; i++) {
       const ctx = await browser.newContext({ storageState: { cookies: [], origins: [] } });
       const page = await ctx.newPage();
-      await page.goto(`/watch/${token}`);
+      await gotoRetrying(page, `/watch/${token}`);
       await page.waitForFunction(() => document.querySelector("video, audio"), null, {
         polling: "raf",
         timeout: 30_000,