fix(marketplace): close client contract gaps

tests/unit/plugin-marketplace-store.test.ts

@@ -199,4 +199,32 @@ describe('plugin Marketplace store', () => {
       reason: 'plugin_signature_invalid: Release signature is invalid',
     });
   });
+
+  it('preserves the installed Beta channel when a device update fails', async () => {
+    const error = Object.assign(new Error('Release is temporarily unavailable'), {
+      code: 'plugin_release_unavailable',
+    });
+    const store = createPluginMarketplaceStore({
+      installBeta: vi.fn().mockResolvedValue({
+        status: 'installed',
+        pluginId: 'makelore.notes',
+        releaseId: 'release-beta-1',
+        version: '2.0.0-beta.1',
+        channel: 'beta',
+      }),
+      update: vi.fn().mockRejectedValue(error),
+    });
+    store.getState().activateAccount('account-a');
+    await store.getState().installBeta('makelore.notes');
+
+    await expect(store.getState().update('makelore.notes')).rejects.toBe(error);
+    expect(store.getState().installations['makelore.notes']).toMatchObject({
+      status: 'unavailable',
+      pluginId: 'makelore.notes',
+      releaseId: 'release-beta-1',
+      version: '2.0.0-beta.1',
+      channel: 'beta',
+      reason: 'plugin_release_unavailable: Release is temporarily unavailable',
+    });
+  });
 });