feat: P5/P6 model swap + modal fix + doc consolidation

feat: 15 targeted improvements — RAG persistence, bus failover, agent hardening, deps sync

fix: llm.chat IndexError (lazy Ollama warm + safe _resolve_backend fallback) + chat self-send returns direct

feat: relay hub serves in-process node directly so Space answers relay RPCs

Add all-to-all internet mesh over relay hub (P1-P3) + user-story screenshot proof

docs: add local-node<->HF-Space connection proof (screenshots + make_proof.py)

fix: HF bus /bus/v1/call uses Body(...) not Request (422 on Space FastAPI)

feat: Nemotron Space, Modal backend, sponsor prize targeting, improvements doc

feat: Phase 3 types/constants, ARCHITECTURE.md, HF connect script, tasks update

fix: 0 test failures; FileService; real RagService; emergency probe; chat return

feat: mesh graph tab, routing trace, QR invite, remove all fakes, specialized-node tests

fix: node identity, Gradio 6 chatbot format, peer discovery; add routing+special-node docs; screenshots