Default to Groq llama, NVIDIA 9B in registry as featured option

final copy done

Apply gitignore, add app.py, stop tracking db and env

feat: clue similarity, linked list progression, multi-NPC conversation loop complete

added NPCNode, SQLite memory, linked list, clue similarity, best-of-N pipeline

fixed features, stage 1 complete

feat: constraint checker working, flag scanner + LLM judge returning PASS/FAIL

feat: full pipeline working, FAISS retr done, remove duplicate hits

first commit