export function assert(condition: boolean, message: string): asserts condition {
  if (!condition) {
    const error = new Error(`Assertion failed: ${message}`);
    if (import.meta.env.DEV) {
      console.error('[Assertion]', message, error.stack);
      throw error;
    } else {
      console.warn('[Assertion] (prod silenced):', message);
    }
  }
}