fix: require runtime evidence in budget gate

scripts/verify-runtime-budgets.mjs

@@ -0,0 +1,35 @@
+#!/usr/bin/env node
+import { spawn } from 'node:child_process';
+import { access } from 'node:fs/promises';
+import { resolve } from 'node:path';
+
+const repositoryRoot = process.cwd();
+const tracePath = resolve(repositoryRoot, 'test-results/runtime-budget-trace.v1.json');
+
+const runNode = (args) => new Promise((resolveRun, rejectRun) => {
+  const child = spawn(process.execPath, args, {
+    cwd: repositoryRoot,
+    env: process.env,
+    stdio: 'inherit',
+  });
+  child.once('error', rejectRun);
+  child.once('exit', (code, signal) => {
+    if (code === 0) resolveRun();
+    else rejectRun(new Error(`Command failed${signal === null ? ` with exit code ${code}` : ` from signal ${signal}`}.`));
+  });
+});
+
+await runNode([
+  resolve(repositoryRoot, 'node_modules/@playwright/test/cli.js'),
+  'test',
+  'tests/performance/runtime-budget-trace.spec.ts',
+  '--project=runtime-budget-desktop',
+  '--workers=1',
+]);
+await access(tracePath);
+await runNode([
+  resolve(repositoryRoot, 'scripts/check-bundle-budgets.mjs'),
+  'dist',
+  '--runtime-trace',
+  tracePath,
+]);