Hydrogen-1.0 MIT Open Weights: Gated BF16, NVFP4 262K Context Cliff, and Vendor FSR vs GPT-6 Astra

Deep Principle Nov 2: Hydrogen-1.0 — 753B MIT MoE from GLM-5.3; gated BF16 vs ungated NVFP4/MXFP4; SGLang recipes; 1M card vs 262K NVFP4 context cliff; vendor FSR/GPQA vs GPT-6 Astra; verify-before-trust science checklist for builders.