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.

package-lock.json

@@ -7924,7 +7924,7 @@
     },
     "packages/server": {
       "name": "@johanleroy/git-arboretum",
-      "version": "2.0.0",
+      "version": "3.0.0",
       "license": "MIT",
       "dependencies": {
         "@fastify/cookie": "^11.0.0",
@@ -8053,7 +8053,7 @@
     },
     "packages/vscode": {
       "name": "git-arboretum",
-      "version": "0.2.0",
+      "version": "0.3.0",
       "license": "MIT",
       "devDependencies": {
         "@arboretum/shared": "0.1.0",