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

feat(rag): docs ingestion + UI/bus enhancements (P3 continuation)

fix(bus): fail over to remote provider when local errors + stamp _routed_via

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

Quality improvements: Unicode chars, Token class, imports, type hints, formatting

feat: real node-to-node HTTP peering (local <-> HF Space)

Fix: Ruff linting issues - SIM/E402/F401 violations

fix: easter-egg ticker now properly works in Gradio app

feat: WebLLM browser agent with PeerJS mesh, HybridRAG, news signals, and easter-egg ticker

fix(llm): single multi-model llm.chat so sponsor backends are reachable

feat: federated RAG + comprehensive security fixes

feat: impl_ref §22 gap-fill — all missing symbols implemented

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

feat: impl_ref gaps closed — Nemotron/OpenBMB backends, spec refs, extended UI, HOWTO, multi-node E2E

feat: implement all M01-M13, X01-X04 modules + quality gate fixes

Build Phase 1 HearthNet Space