fix: complete marketplace client remediation

tests/unit/coding-product-services.test.ts

@@ -350,6 +350,31 @@ describe('Marketplace public Library projection', () => {
     expect(JSON.stringify(result)).not.toMatch(/sha256|sizeBytes|installedAt|packageRoot|definition|account|admission|token/i);
   });
 
+  it('projects an installed but client-incompatible package without discarding its cached release', async () => {
+    const marketplace = {
+      readCatalog: vi.fn(), readDetail: vi.fn(), readLibrary: vi.fn().mockResolvedValue(snapshot),
+      acquire: vi.fn(), remove: vi.fn(),
+    };
+    const packageStore = {
+      readInstalledIndex: vi.fn().mockResolvedValue(records),
+      getInstalled: vi.fn().mockResolvedValue({
+        ...records[0], channel: 'beta', packageRoot: 'ignored', definition: {},
+        unavailableReason: 'plugin_incompatible_client' as const,
+      }),
+      resolveAndInstall: vi.fn(), removeUnused: vi.fn(),
+    };
+    const service = createCodingPluginMarketplaceService({
+      marketplace: marketplace as never, packageStore: packageStore as never, clientVersion: '3.0.0',
+    });
+
+    await expect(service.readLibrary()).resolves.toMatchObject({
+      installations: [{
+        status: 'unavailable', pluginId: 'makelore.notes', releaseId: 'release-old', version: '1.0.0',
+        channel: 'beta', reason: 'plugin_incompatible_client',
+      }],
+    });
+  });
+
   it.each(['acquire', 'remove'] as const)('returns an authoritative joined snapshot after %s', async (action) => {
     const marketplace = {
       readCatalog: vi.fn(), readDetail: vi.fn(), readLibrary: vi.fn(),