feat: Implement intent router early return and fix material names null checks

fix: support scope-wide UC overview queries

fix(rag): preserve full context in answerability gate

fix(rag): improve context containment and scope refusal

merge remote changes from hf main and integrate dynamic containment filter

feat(rag): implement dynamic containment filter for out-of-scope queries and enforce strict grounding

fix(rag): prefer requested UC folder over stale subject mapping

Reapply "fix: resolve subject ids to canonical faiss folders"

Revert "fix: resolve subject ids to canonical faiss folders"

fix: resolve subject ids to canonical faiss folders

chore: initial deploy to HF Spaces