feat(sentra): agentic-RAG /rag endpoint + UI (organ=immune, additive, Doctrine v10/v11). Adds /api/sentra/v1/rag (embed query -> FAISS organ lookup -> top-k chunks + similarity + sources; with_response=true routes top-k to the LLM tier and returns answer + sources + Λ-receipt) and a /rag UI. Corpus + per-organ FAISS indexes pulled at boot from SZLHOLDINGS/rag-corpus-v1 (BGE-base-en-v1.5, 768-dim, 762 chunks). HONESTY: LLM answers cite chunk IDs; Λ-receipt signature field = PLACEHOLDER (Sigstore CI not wired). Mythos->Hatun-Willay. ADDITIVE only — preserves all existing routes. HfApi DIRECT, no GitHub Actions.
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