Add PromptDualStreamRefinerNode that produces a positive and negative
prompt pair in a single pass via Ollama, intended for the shipped Q8
GGUF of qwen2-5-7b-dual-stream-prompt-lora. Reuses OllamaClient for
streaming, timeouts, progress, and llama-runner crash handling, and
parses Positive/Negative output defensively across label variants.
Includes config/Modelfile.dualstream, unit tests, node registration,
and a corrected implementation plan replacing the invalid local
transformers/PEFT approach.