docs: rebrand model card to Nexis-14B by Parallax (Founder: Samrish)

Upload README.md with huggingface_hub

docs: update official model card with benchmark metadata

docs: Update model card with verified multi-domain scorecard, 125 GRPO steps, and cloud hub links

Update comprehensive official Model Card with complete technical specifications

Upload real GRPO trained LoRA adapter (checkpoint-100)

Initial model card submission for Open LLM Leaderboard v2