fix: switch to Qwen2.5-7B-Instruct with provider=auto — confirmed available on HF

fix: switch provider from hf-inference to nebius — hf-inference dropped large LLM support (July 2025 per docs)

fix: switch HF model to mistral-7b

fix: update HuggingFace model ID

updates

updates

feat: Nuclear visibility fix (Black on White) + Phase 2 features (Radar table, Feed sorting)

fix: remove stale Gemini/ChromaDB refs, improve chart contrast, harden error handling

fix: switch HuggingFace provider to cerebras + Llama-3.1-8B-Instruct

feat: model unification, node truncation, generate brief button

refactor: replace Gemini with HuggingFace/LangGraph stack