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

Fix OpenEnv and HF training flows

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

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

DriftShield Phase B: 4 new grader components, 5 new penalties, negation-aware forbidden phrases

DriftShield Phase A: D1 collection, 4 runtime-failure tasks, ops.get_recommendation, recoverable schema drift

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

fix: align inference.py env vars with spec and clean up repo

fix: app.py main check for openenv validate

clean rewrite: shorter vars, no comments, same logic