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

docs: live screenshot of Ask tab working with local Ollama LLM

docs: live screenshot of local node meshing with HF Space over the relay

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)

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

test: 30 user-story E2E tests (Playwright) + 31 annotated screenshots