Gemma 4 Jinja template improvements boost tool reliability

Native tool-calling support and prefix-preserving templates mark a significant maturation for Google's open-weights ecosystem. Interleaved templates preserve the model's reasoning steps in context, which is critical for multi-step planning, while native tag support reduces parsing errors compared to JSON-only patterns. With integration in Unsloth and llama.cpp build b8664+, developers should transition to this interleaved format to resolve common infinite retry bugs in complex agentic workflows.