fix: T4-safe 4bit compute, eval/audit resilience, async inference, plot_rewards CSV/table

Use SVG reward curve for HF Space Git (reject binary PNG)

Add DriftShield proof artifacts and generator script

Rebrand: drop 'Support Ops' user-facing text; add DriftShield* aliases; tighten README

feat: GRPO training stack (Qwen3 + Unsloth opt-in, curriculum, eval, audit)