- renderers: add gemma4-nemotron renderer
Add a Gemma 4 renderer variant that renders assistant content before
its tool calls rather than after the tool responses. Models opt in with
RENDERER gemma4-nemotron; gemma4 auto-detection is unchanged.
Adds the corresponding chat template as a test fixture for Jinja parity
checks.
- mlx: support Gemma 4 targets with DFlash drafts
Load a draft-owned output head when its config requires one, while preserving the target-head path used by existing DFlash models.
Expose Gemma 4 hidden-state taps and raw logits for speculative decoding. Report safetensors target precision independently of quantized draft weights.