The local non-external GGUF path (llama-server) accepts frequency_penalty,
seed, stop and parallel_tool_calls, but the safetensors / HF transformers
worker has no equivalent kwargs and silently drops them. Showing the
controls there has been confusing reviewers: the UI promises a knob that
does nothing.
Gate frequencyPenalty / seed / stop / parallelToolCalls on `isGguf` for
non-external local models so safetensors sessions only show controls the
backend actually honours. External-provider gating is unchanged.
Stale persisted values from a prior GGUF session are still sent on the
wire but the safetensors worker keeps absorbing them via **_unused, so
this is a presentation-only change with no behaviour difference.
9cd730130e