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/test/ws-client.test.ts

@@ -124,6 +124,18 @@ describe('ArbWsClient', () => {
     expect(acks[acks.length - 1]).toMatchObject({ bytes: FLOW.ACK_EVERY_BYTES });
   });
 
+  it('route session_archived vers onSessionArchived', () => {
+    const archived: string[] = [];
+    const f = new FakeSocket();
+    const c = new ArbWsClient({ socketFactory: () => f, onSessionArchived: (id) => archived.push(id) });
+    c.configure('http://127.0.0.1:7317', 'tok');
+    c.connect();
+    f.fireOpen();
+    f.fireText({ type: 'hello_ok', protocol: 1, serverVersion: '2.0.0' });
+    f.fireText({ type: 'session_archived', sessionId: 'sess-42' });
+    expect(archived).toEqual(['sess-42']);
+  });
+
   it('envoie stdin/resize sur le bon canal', async () => {
     const p = client.attach({ sessionId: 'sess', mode: 'interactive', cols: 80, rows: 24, sink: makeNoopSink() });
     fake.fireText({ type: 'attached', channel: 5, sessionId: 'sess', mode: 'interactive', controlling: true });