chore(cleanup): purge stale narrative/tombstones/dead code — codebase reads as the current standard

docs: KI-071 — reconcile docs with code reality (Qwen 80B / Nemotron 30B / Mistral 675B as current primaries)

refactor: KI-047 — bucket reorg (Option A safe subset)

Stack A: NIM brain + Maverick judge + Sarvam voice/Indic (D-019). Data moved to insurance-bot-data dataset; Space is now code-only.

Deploy v1 — single-Docker FastAPI + Next.js + RAG + voice + faithfulness