Replace tap tests with node:test

[Copilot]

Migrate test suite from tap to Node.js built-in node:test module.

Changes

• test/simple-test.ts: Use node:test and node:assert instead of tap
• package.json:
  • Update test-only script to node --import tsx --test test/*.ts
  • Remove tap, ts-node, snazzy, standardx dev dependencies
  • Add tsx for TypeScript test execution
• Remove .taprc: No longer needed

Before/After

// Before
import { test } from 'tap';
test('example', async ({ equal }) => {
  equal(queue.size, 0);
});

// After
import { test } from 'node:test';
import assert from 'node:assert';
test('example', async () => {
  assert.strictEqual(queue.size, 0);
});

Original prompt

replace tap tests with node:tests

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