Feat v0.4.4 rich editor import export

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

CHANGELOG.md

@@ -2,6 +2,32 @@
 
 All notable changes to Switchboard Core are documented here.
 
+## v0.4.4 — Rich Editor + Import/Export
+
+### Added
+
+- **CodeMirror 6 integration**: Notes editor now uses the vendored CM6 bundle
+  (`CM.noteEditor()`) for rich markdown editing with syntax highlighting,
+  wikilink autocomplete (`[[` triggers note title completion), and inline
+  preview decorations for headings, code blocks, and blockquotes.
+- **CM6 dynamic loading**: Bundle loaded via `<script>` tag at boot time.
+  Falls back to plain textarea if CM6 is unavailable.
+- **Export as .md**: Export button in editor header downloads the note as a
+  Markdown file with YAML frontmatter (title, tags, created date).
+- **Import .md**: Import button in topbar allows uploading `.md`/`.markdown`/`.txt`
+  files. Parses YAML frontmatter for title and tags, creates note via API.
+- **CSS for CM6**: Editor fills the container with `max-height: none` override
+  and proper scroller padding.
+
+### Changed
+
+- Notes package version bumped from 0.4.0 to 0.5.0.
+- `EditorPane` component refactored to support CM6 with mutable refs for
+  title/body (required for CM6 callback closures).
+- Ctrl/Cmd+S save works in both CM6 and textarea fallback modes.
+
+---
+
 ## v0.4.3 — Backlinks + Wikilinks
 
 ### Added