fix: ensure Chrome is installed

Fixes that the runtime checks would be skipped if Chrome isn't installed.

Author: crisbeto

runner/orchestration/generate.ts

@@ -43,6 +43,7 @@ import { logReportHeader } from '../reporting/report-logging.js';
 import { DynamicProgressLogger } from '../progress/dynamic-progress-logger.js';
 import { UserFacingError } from '../utils/errors.js';
 import { getRunGroupId } from './grouping.js';
+import { executeCommand } from '../utils/exec.js';
 
 /**
  * Orchestrates the entire assessment process for each prompt defined in the `prompts` array.
@@ -108,6 +109,9 @@ export async function generateCodeAndAssess(options: {
 
   logReportHeader(env, promptsToProcess.length, appConcurrency, options);
 
+  // We need Chrome to collect runtime information.
+  await installChrome();
+
   if (
     options.startMcp &&
     env.mcpServerOptions.length &&
@@ -647,6 +651,24 @@ function getCandidateExecutablePrompts(
   return result.filter(({ name }) => name.includes(promptFilter));
 }
 
+let chromeInstallPromise: Promise<unknown> | null = null;
+
+/** Installs Chrome which is necessary for runtime checks. */
+async function installChrome(): Promise<void> {
+  // Ensure that Chrome is installed. Note that the
+  // installation is global so we can reuse the promise.
+  if (!chromeInstallPromise) {
+    chromeInstallPromise = executeCommand(
+      'npx puppeteer browsers install chrome',
+      process.cwd()
+    );
+  }
+
+  try {
+    await chromeInstallPromise;
+  } catch {}
+}
+
 /**
  * Shuffles the elements of an array randomly in place.
  *