docs: update README with Neo4j Graph RAG, update news agent for triple-store ingestion

feat: add ChromaDB bulk ingest script, populate 155 chunks from 34 docs

fix: prevent double confidence disclaimer in chat responses

fix: replace LLM-based graph keyword extraction with instant text parsing

feat: integrate Neo4j graph RAG into chat pipeline and live ingestion

feat: add Python graph builder for Neo4j entity extraction via Ollama

feat: add Neo4j graph store service, API routes, and server integration

docs: add Neo4j Graph RAG implementation plan

docs: add Neo4j Graph RAG design spec

docs: update README with voice input, reasoning transparency, KB health monitoring, and Mistral 24B

fix: add crash protection and pm2 config for permanent uptime

docs: revamp README with table of contents, mermaid diagrams, and better structure

feat: add monitoring dashboard, feedback system, gap resolution, and LLM re-ranking

feat: add ChromaDB, gap detection, N8N workflow, and expanded knowledge base

fix: remove unreadable ASCII art from README