test: run focused regressions with the repository Vitest runner

Signed-off-by: Rudy Celekli <rudy@gradiahq.com>

tests/json-memory-envelope.test.mjs

@@ -1,4 +1,4 @@
-import test from 'node:test';
+import { test } from 'vitest';
 import assert from 'node:assert/strict';
 import { mkdtempSync, rmSync, writeFileSync, readFileSync } from 'node:fs';
 import { join } from 'node:path';