Deploy student-first exam coach

Sync real MiniCPM traces + schema

Isolate GPU call (graceful fallback on worker failure) + skip ZeroGPU preload

Delete data/codex_trace_public.jsonl with huggingface_hub

[Codex] Replace trace dataset with app outputs

[Codex] Add optional Nemotron runway and public trace

Deploy Exam Panic Rescue staging Space