export async function embedText(text: string, apiKey?: string): Promise<number[]> {
  const key = apiKey ?? process.env.VOYAGE_API_KEY
  if (!key) throw new Error('VOYAGE_API_KEY is not set')
  const res = await fetch('https://api.voyageai.com/v1/embeddings', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': `Bearer ${key}`,
    },
    body: JSON.stringify({ input: [text], model: 'voyage-3-lite' }),
  })
  if (!res.ok) throw new Error(`Voyage embed failed: ${res.status}`)
  const json = await res.json() as { data: Array<{ embedding: number[] }> }
  return json.data[0].embedding
}