Generate embeddings for multiple texts in a single Vertex AI call.

Same options as embed/3. Returns {:ok, %{embeddings: [[float()]]}}.

Generate an embedding for a single text using Vertex AI.

Options

• :model - Embedding model (default: "text-embedding-005")
• :task_type - One of "RETRIEVAL_DOCUMENT", "RETRIEVAL_QUERY", "SEMANTIC_SIMILARITY", etc.
• :dimensions - Output dimensionality (default: 768)

Returns {:ok, %{embedding: [float()]}} or {:error, reason}.