Feat v0.4.0 notes surface (#22)

Add Notes as a standard installable surface package (type: full,
tier: starlark). Markdown editor with sidebar note list, live
preview toggle, auto-save, pin/archive, and full-text search.
Zero kernel changes — proves extension stack E2E.

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

ROADMAP.md

@@ -1,6 +1,6 @@
 # Switchboard Core — Roadmap
 
-## Current: v0.3.7 — Package Audit
+## Current: v0.4.0 — Notes Surface
 
 Fork of chat-switchboard, gutted to a pure extension platform. All AI/chat
 features removed from the kernel. What remains is the minimum viable
@@ -225,15 +225,46 @@ Builder image for faster builds, bundled packages for zero-config first run.
 | Distribution docs | ✅ | `docs/DISTRIBUTION.md` — quick start, bundled packages, builder image, custom builds, production deployment. |
 | Tests | ✅ | 6 handler tests (fresh install, skip existing, missing dir, empty dir, dormant handling, allowlist filtering). All existing tests pass. |
 
-## v0.4.0 — Notes Surface
+## v0.4.x — Notes Surface
 
-Obsidian-style rich-text notes rebuilt as an installable surface package.
+Obsidian-style notes rebuilt as an installable surface package.
 Zero platform special-casing. Proves the full extension stack E2E.
 
-- Notes as `.pkg` archive
-- Rich text editor (ProseMirror or similar)
-- Folder tree, backlinks, tags — all extension-provided
-- Markdown import/export
+### v0.4.0 — Core Notes CRUD + Markdown Editor
+
+| Step | Status | Description |
+|------|--------|-------------|
+| Package scaffold | ✅ | `packages/notes/` with manifest, script.star, JS, CSS, README. Type: full, tier: starlark. |
+| Notes CRUD backend | ✅ | Starlark `on_request()` — list, create, get, update, delete, search, stats. Lightweight list projection (no body). |
+| Notes table | ✅ | `ext_notes_notes` — title, body (TEXT), folder_id, pinned, archived, creator_id, updated_at. |
+| Markdown editor | ✅ | Preact+htm frontend: sidebar note list, title input, markdown textarea, auto-save (1s debounce). |
+| Live preview | ✅ | Inline markdown renderer (~100 lines): headings, bold, italic, code, links, lists, blockquotes, hr. |
+| Search | ✅ | Client-side LIKE search over title/body. Search bar in sidebar. |
+| Pin/archive | ✅ | Pin notes to top, soft-delete via archive, hard delete with `?hard=1`. |
+
+### v0.4.1 — Folders + Navigation Tree (planned)
+
+- `folders` table (name, parent_id, sort_order)
+- Folder CRUD API (4 routes) + note move
+- Collapsible folder tree in sidebar
+- Breadcrumb trail in editor
+
+### v0.4.2 — Tags + Search (planned)
+
+- `note_tags` table (note_id, tag)
+- Tag management inline with note save
+- Tag filter in sidebar, tag pills on cards
+
+### v0.4.3 — Backlinks + Wikilinks (planned)
+
+- `note_links` table (source, target, link_text)
+- `[[wikilink]]` extraction on save
+- Backlinks panel, clickable links in preview
+
+### v0.4.4 — Rich Editor + Import/Export (planned)
+
+- Vendored CodeMirror 6 markdown bundle
+- Markdown file import/export
 
 ## v0.5.0 — MVP