Stale intel reflected commit 01f7456 (pre-Phase-4). Refresh adds the shared-lists
+ SSE subsystem: 21 API endpoints (was 10), lists/sse routes, listEmitter/listAccess/rank
libs, PWA lists surface, 7 new arch decisions, and Phase 4 deps (react-router, @dnd-kit,
fractional-indexing). Canonical filenames preserved; API-SURFACE.md + .last-refresh.json regenerated.