feat(pipeline): RAG quality gate, live coverage, streaming API, recursion limit

refactor(pipeline): metadata-driven coverage, per-topic scroll, pure gap fn

feat(kg): COVERED_BY edges, wipe script, scroll_all, docs_for_topic

feat(kb): Solid Gartner KB — cross-industry Wikidata seed, Wikidata-native relationships, 7-day signal cache

feat(agent): implement comprehensive logging and fix recursion loop

feat(graph): implement lean Neo4j Knowledge Graph build with spaCy NER