- Replaced manual prompt building with GGUF's chat template rendered through minijinja (Rust Jinja2 engine)
- Simplified template: removed multi-step tool detection, reasoning extraction (not needed at template level)
- Added reasoning_content separation: clean_text() returns (reasoning, answer) tuple
- Added reasoning_content field to ResponseMessage and SseDelta for OpenAI-compatible output
- Embedded template at build time via include_str! from templates/chat_template.jinja
- Built-in support for enable_thinking, tool_definitions, tool_calls, tool_response
- Token-by-token streaming via Server-Sent Events
- tokio::sync::mpsc channel + ReceiverStream for clean async
- OpenAI SSE format: role chunk → content chunks → finish chunk
- Non-streaming still works with the same code path
- Uses spawn_blocking pattern for CPU-bound inference