fix: proper markdown renderer with headings, lists, bold, implicit heading detection

fix: HF Spaces YAML header, deep research mode, Llama 3 default, provider routing fix

feat: set Llama 3 8B as recommended default model

fix: eliminate double pipeline run, fix provider routing, restore Llama 3

fix: use router.huggingface.co to bypass DNS failure on HF Spaces, default to Qwen 2.5

fix: use router.huggingface.co to bypass DNS failure on HF Spaces, default to Qwen 2.5

fix: use InferenceClient directly to fix DNS error on HF Spaces, add search retry/fallback

fix: use InferenceClient directly to fix DNS error on HF Spaces, add search retry/fallback

fix: DuckDuckGo rate limit handling with retry and fallback

Initial commit — NeuroResearch Multi-Agent System