Deploy main 5e572ce to prod (#198)

main's tree, with next merged on 26 October, as one commit onto prod, on sneak's order.

Model: opus-5-5
Co-authored-by: clawbot <clawbot@noreply.example.org>

test/viewport/harness.js

@@ -16,6 +16,10 @@ import { collectLayoutFacts } from "./facts.js";
 import { evaluateChecks, INTERACTIVE_SELECTORS } from "./checks.js";
 import { deriveViewports } from "./viewports.js";
 
+// page.waitForFunction and page.evaluate run the functions given them in
+// the page, where these are defined.
+/* global document, requestAnimationFrame */
+
 function required(name) {
     const value = process.env[name];
     if (!value) {
@@ -47,7 +51,8 @@ const PROBE_DELAYS_MS = [2, 45, 123, 456, 780];
 // offline row rendering is exercised too.
 const UNREACHABLE_MODULUS = 7;
 // The gateway candidate that "answers", so gateway detection succeeds and
-// the Local Gateway row renders. Matches GATEWAY_CANDIDATES in src/main.js.
+// the Local Gateway row renders. Matches GATEWAY_CANDIDATES in
+// web/src/main.js.
 const RESPONSIVE_GATEWAY = "http://192.168.1.1";
 
 const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
@@ -62,7 +67,6 @@ function stableHash(text) {
 
 async function connectBrowser() {
     const deadline = Date.now() + BROWSER_TIMEOUT_MS;
-    let lastError;
     for (;;) {
         try {
             const response = await fetch(`${CDP_URL}/json/version`);
@@ -77,9 +81,10 @@ async function connectBrowser() {
             });
             return { browser, version: info.Browser };
         } catch (error) {
-            lastError = error;
             if (Date.now() > deadline) {
-                throw new Error(`browser never came up: ${lastError}`);
+                throw new Error(`browser never came up: ${error}`, {
+                    cause: error,
+                });
             }
             await sleep(250);
         }