Description

• Closes Support agent detection with configured reporters #10217

This PR exposes Vitest’s environment-aware default reporter list through configDefaults.reporters, so users can add their own reporters without losing "good defaults" that Vitest normally applies automatically, such as the minimal/agent reporter in AI-agent environments or github-actions on GitHub Actions, for example:

import { configDefaults, defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    reporters: ['html', ...configDefaults.reporters],
  },
})

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