release: IDE multi-projet + app native (git-arboretum 3.0.0, vscode 0.3.0, desktop 0.1.0)

Daemon 3.0.0 : marque le cap « IDE IA multi-projet + app de bureau native » (refonte additive, PROTOCOL_VERSION inchangé ; le tarball embarque la nouvelle SPA IDE + le handshake token desktop). Extension VS Code 0.3.0 : deep-link « Open Worktree IDE » vers l'IDE multi-projet, encodage wt-key unifié via @arboretum/shared (CHANGELOG + README à jour). Paquet desktop 0.1.0 (première release).

package.json ET package-lock.json bumpés (npm ci strict). 431 tests, 0 tiret, builds daemon/web/vscode/site verts.

packages/vscode/CHANGELOG.md

@@ -1,5 +1,17 @@
 # Changelog
 
+## 0.3.0
+
+Aligns with the daemon's **multi-project IDE** milestone: the web UI is now a single IDE that holds all
+your open projects at once (a unified project / worktree / session tree, a tabbed Monaco editor, and
+Claude terminals docked at the bottom), and ships as a native desktop app too. The extension stays a
+lightweight visual worktree manager (no editor duplicated here), and its deep-link now opens that IDE:
+
+- **Open Worktree IDE** now deep-links into the multi-project IDE (route `/workspace/:repoId/:wt`) and
+  focuses the chosen worktree in its unified tree.
+- Worktree deep-link encoding unified with the web front through the shared `encodeWtKey`
+  (`@arboretum/shared`), so links resolve consistently on both sides.
+
 ## 0.2.0
 
 Follows the daemon's "worktree IDE" milestone (P7→P12), while keeping the extension a lightweight