@spec list(ArchAstro.Client.t()) ::
  {:ok, ArchAstro.Types.KnowledgeSourceKindListResponse.t()}
  | {:error, ArchAstro.Error.reason()}

List creatable knowledge source kinds

Returns the fixed set of knowledge source types that can be created directly via POST /api/v1/knowledge_sources. Use this endpoint to discover valid values for the type param before calling the create endpoint.

Source kinds populated by server-driven flows — such as webhook/inbound, connectors/*/emails, and thread/messages — are intentionally excluded from this list, as they cannot be created through the API.

List of knowledge source kinds available for creation via the API.