execute Streaming
open override fun executeStreaming(prompt: Prompt, model: LLModel, tools: List<ToolDescriptor>): Flow<StreamFrame>
Delegates streaming to delegate; no consumption is captured from streamed frames.
open override fun executeStreaming(prompt: Prompt, resolvedModel: ResolvedModel, tools: List<ToolDescriptor>): Flow<StreamFrame>
Pre-resolved-model overload of executeStreaming; also captures nothing.