New `knowledge_base_search` query

You can now search your account's knowledge base via the API using the knowledge_base_search query. It performs an AI-powered search across knowledge base snippets and returns an LLM-generated answer along with the raw source snippets.

query {
  knowledge_base_search(query: "What is our refund policy?", limit: 5) {
    answer
    raw_snippets {
      id
      title
      text
      url
      distance
    }
  }
}