docs: update official model card with benchmark metadata

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

SAM-AI R1 checkpoint step 125

SAM-AI R1 checkpoint step 100

SAM-AI R1 checkpoint step 75

SAM-AI R1 checkpoint step 50

Upload tokenizer

SAM-AI R1 checkpoint step 25

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

initial commit