Replace the catch-all RuntimeError wrapper in OllamaClient.generate_streaming
with a StreamResult dataclass that categorises failures (ok, timeout, transient,
model_crash, server_error, unavailable). Llama-runner crashes (HTTP 500 with
"runner terminated" / "exit status" / "load failed") are detected and surfaced
as user-actionable messages in the ComfyUI prompt output instead of bubbling
up as Python stacktraces.
PromptGenerator, NegativePrompt, and PromptRefiner nodes now branch on
result.kind: model_crash / server_error / unavailable surface the message
directly (subprocess fallback would also fail), while timeout / transient
fall through to the existing subprocess fallback path.
Adds 6 unit tests covering each error class plus the success path. Updates
the existing PromptRefiner seed tests to return StreamResult from mocks.
limbicnation
bf54b54ca9