notes(#88): en tab set is Library|Explore|Kanban
notes(#88): mobile selection entry — selectionchange path, draft survives scrolls
notes(#88): trial feedback — Explore/Kanban en labels, .md download, two-step annotate popover
notes (#88): agent write tools — notes__create (source pinned) + notes__update (diff-first, expectVersion read gate)
notes (#88): AI passes + agent surfaces (notes__ MCP namespace, assistant group, <system_context> injection)
docs: design-notes — notes feature design (issue #88)