feat: complete Truth Register overhaul with RAG playground, Git blame drawer, revision loop, AI hub, de-jargonified lineage graph, and 6 clinical/enterprise starter templates

fix: auto-generate candidate knowledge proposals on document ingest and upgrade Truth Register empty state

Add DocWeave authentication integration, dynamic workspace selection, search, Dockerfile, and HF Spaces config

feat: MAANG-grade Studio UI (Tailwind + Lucide icons + confetti) and Hugging Face Docker deployment ready

feat: initial commit for DiffWeave platform