Update version, changelog, and roadmap for v0.4.1

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -2,6 +2,40 @@
 
 All notable changes to Switchboard Core are documented here.
 
+## v0.4.1 — Folders + Navigation Tree
+
+### Added
+
+- **Folders table** (`ext_notes_folders`): name, parent_id, creator_id,
+  sort_order. Indexed on parent_id and creator_id. Nested hierarchy via
+  parent_id foreign key (empty string = root).
+- **Folder CRUD API**: 5 new Starlark handlers — list, create, update, delete
+  folders plus a dedicated move-note endpoint (`POST /notes/move`).
+- **Navigation tree**: `FolderTree` + `FolderNode` Preact components in the
+  sidebar. Flat API response built into a nested tree client-side via `useMemo`.
+  Expand/collapse toggles, depth-based indentation, inline rename via
+  right-click context menu.
+- **Folder filtering**: Clicking a folder filters notes by `folder_id` query
+  param. "All Notes" clears the filter. "Unfiled" shows notes with empty
+  folder_id (client-side filter).
+- **Editor folder select**: Dropdown in the editor header moves notes between
+  folders. Shows nested hierarchy with `└` prefix indentation.
+- **Folder-aware note creation**: New notes inherit the active folder's ID.
+- **Delete cascade**: Deleting a folder orphans its notes (moves to Unfiled)
+  and reparents child folders to the deleted folder's parent.
+- **Updated stats**: `/stats` response now includes `unfiled` and `folders`
+  counts.
+
+### Data model
+
+| Table | Columns |
+|-------|---------|
+| `ext_notes_folders` | name, parent_id, creator_id, sort_order |
+
+### Notes package version
+
+Bumped from 0.1.0 → 0.2.0. 12 API routes (7 existing + 5 new).
+
 ## v0.4.0 — Notes Surface
 
 ### Added