{
  // feature: json5 (comments, trailing commas) + __variants
  // try: /__test/profile · ?plan=pro · header X-Admin: 1
  __variants: [
    {
      when: { query: { plan: 'pro' } },
      delay: 200,
      body: { plan: 'pro', seats: 25, features: ['sso', 'audit'] },
    },
    {
      when: { headers: { 'x-admin': '1' } },
      body: { plan: 'enterprise', seats: 999, features: ['sso', 'audit', 'scim'] },
    },
    {
      // fallback (no `when`)
      body: { plan: 'free', seats: 1, features: [] },
    },
  ],
}