feat(vscode): statut git détaillé, sessions archivées, lien IDE web, fetch/pull (0.2.0)

Reflète la refonte IDE en supervision légère, sans dupliquer l'éditeur :
- statut git fin dans l'arbre (staged/unstaged/conflits + dernier commit) ;
- commande « Open Worktree IDE » → deep-link /workspace/:repoId/:wt ;
- commandes fetch / pull (ff-only|rebase) sur les worktrees ;
- event WS session_archived + réglage showArchivedSessions (badge + filtre).
README/CHANGELOG + tests (config/rest-client/ws-client).

packages/vscode/README.md

@@ -9,7 +9,11 @@ integration on top of the [Arboretum](https://git.lidge.fr/johanleroy/arboretum)
   daemon's PTY) — you get VS Code's own rendering, scrollback, copy/paste and links for free.
 - **Waiting alerts**: a status-bar counter and native notifications when a Claude session is waiting for
   input — answer **Yes/No** without even opening the terminal (uses the daemon's `answer` command).
-- **Git mutations** from the tree: create worktree, commit, push, promote to main.
+- **Git mutations** from the tree: create worktree, commit, push, fetch, pull, promote to main — with a
+  **detailed git status** on each worktree (staged / unstaged / conflicts and the last commit subject).
+- **Open Worktree IDE**: jump from any worktree to its full `/workspace` view (file tree, Monaco editor,
+  inline diffs, integrated terminal) in the browser. The extension stays a lightweight visual worktree
+  manager — the heavy editing lives in the web IDE.
 - **Workspace-aware**: the worktree matching your open folder is highlighted; start a session or create a
   worktree for the current folder in one command.
 
@@ -33,6 +37,7 @@ integration on top of the [Arboretum](https://git.lidge.fr/johanleroy/arboretum)
 | --- | --- | --- |
 | `arboretum.url` | `http://127.0.0.1:7317` | Base URL of the daemon (REST + WebSocket). |
 | `arboretum.showExternalSessions` | `false` | Also show Claude sessions started outside Arboretum (CLI). |
+| `arboretum.showArchivedSessions` | `false` | Also show finished sessions auto-archived after their retention window. |
 | `arboretum.notifyOnWaiting` | `true` | Native notification when a session starts waiting for input. |
 
 The extension authenticates with `Authorization: Bearer <token>` on both REST and the WebSocket upgrade.
@@ -48,13 +53,13 @@ The extension is bundled with esbuild (`@arboretum/shared` is inlined → the VS
 npm install
 npm run build:vscode                       # builds @arboretum/shared then bundles the extension
 cd packages/vscode && npx @vscode/vsce package --no-dependencies
-# → git-arboretum-0.1.0.vsix
+# → git-arboretum-0.2.0.vsix
 ```
 
 Install it with **Extensions: Install from VSIX…** in the Command Palette, or:
 
 ```bash
-code --install-extension git-arboretum-0.1.0.vsix   # also: codium / cursor
+code --install-extension git-arboretum-0.2.0.vsix   # also: codium / cursor
 ```
 
 ### Other distribution channels (optional)