Split train and tool simulator modules; mastery curriculum and grader workflow nudge.

feat: default GRPO/eval to Qwen/Qwen3-1.7B + LoRA; disable Qwen3 thinking in chat template

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

Add DriftShield proof artifacts and generator script

Rename files to DriftShield: notebooks, server module, kernel folder

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

DriftShield Phase C: README pivot + driftshield_easy as default curriculum

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