Feat v0.4.4 rich editor import export

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

ROADMAP.md

@@ -1,6 +1,6 @@
 # Switchboard Core — Roadmap
 
-## Current: v0.4.3 — Backlinks + Wikilinks
+## Current: v0.4.4 — Rich Editor + Import/Export
 
 Fork of chat-switchboard, gutted to a pure extension platform. All AI/chat
 features removed from the kernel. What remains is the minimum viable
@@ -281,10 +281,15 @@ Zero platform special-casing. Proves the full extension stack E2E.
 | Backlinks panel | ✅ | Collapsible panel below editor showing all notes linking to current note. Click to navigate. Hidden when empty. |
 | Stats update | ✅ | `/stats` includes `links` count. Notes package version bumped to 0.4.0. |
 
-### v0.4.4 — Rich Editor + Import/Export (planned)
+### v0.4.4 — Rich Editor + Import/Export (complete)
 
-- Vendored CodeMirror 6 markdown bundle
-- Markdown file import/export
+| Step | Status | Description |
+|------|--------|-------------|
+| CM6 integration | ✅ | Load vendored CodeMirror 6 bundle via dynamic `<script>` tag. `CM.noteEditor()` factory with markdown syntax highlighting, wikilink autocomplete, and live preview decorations. Textarea fallback if CM6 unavailable. |
+| Editor wiring | ✅ | EditorPane uses CM6 with `onChange` → auto-save debounce, `onLink` → wikilink navigation, `linkCompleter` → search API autocomplete. Ctrl/Cmd+S force save. Editor fills container via CSS override. |
+| Export as .md | ✅ | Export button in editor header. Downloads note as `.md` file with YAML frontmatter (title, tags, created). Pure client-side Blob download. |
+| Import .md | ✅ | Import button in topbar. File picker for `.md`/`.markdown`/`.txt`. Parses YAML frontmatter for title and tags. Creates note via API with tags. |
+| Notes package v0.5.0 | ✅ | Manifest version bumped from 0.4.0 → 0.5.0. |
 
 ## v0.5.0 — MVP