db: prefer bucket-mounted /data/lineage.db with baked-in fallback

ux: additive filter (click=narrow, more=add) + hub-link icons on every dataset row

explorer: clickable legend filter (toggle relationship types in map + ego views)

explorer: adaptive layout — force for hubs (high fan-out), hierarchical for chains

explorer: overall map default (hubs+chains, sized by derivatives) + corner colour legend

analysis dashboard (Overview tab) + Explorer; type/copy/translation/producer breakdowns

perf: no child cap; hierarchical no-physics layout, straight edges, selective labels, gzip

Tufte restyle + examples dropdown + lru_cache/graph-cap/cache-headers perf

v0: partial-data lineage explorer (FastAPI + vis-network)