fix(plugins): isole les plugins non servables et durcit la réconciliation MCP

Un bundle_url invalide ou un plugin dont l'asset n'est pas réellement
servable passe désormais en état Invalid isolé au lieu de faire
échouer globalement la réconciliation MCP au démarrage — cause racine
de la perte d'affichage à l'installation de hello-plugin (#116/#120).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/infrastructure/tests/plugin_install_load.rs

@@ -146,3 +146,77 @@ async fn installs_sdk_hello_plugin_and_loads_runtime_catalog() {
 
     let _ = fs::remove_dir_all(app_data);
 }
+
+#[tokio::test]
+async fn installed_plugin_with_missing_main_is_isolated_from_runtime_catalog() {
+    let app_data = temp_dir("missing-main-app-data");
+    let source = temp_dir("missing-main-source");
+    fs::write(
+        source.join("idea-plugin.json"),
+        r#"{
+          "ideaPluginManifestVersion": 1,
+          "id": "dev.idea.fixtures.missing-main",
+          "displayName": "Missing Main Plugin",
+          "version": "0.1.0",
+          "main": "dist/index.js",
+          "trustLevel": "full",
+          "capabilities": ["ui"],
+          "contributes": {}
+        }"#,
+    )
+    .unwrap();
+    let packages = Arc::new(FsPluginPackageStore::new(&app_data));
+    let registry = Arc::new(FsPluginRegistryStore::new(&app_data));
+    let validator = Arc::new(JsonPluginManifestValidator::new("0.3.0"));
+    let events = Arc::new(TokioBroadcastEventBus::new());
+    let mcp = Arc::new(ExternalMcpPluginSupervisor::new());
+
+    let install = InstallPluginFromDirectory::new(
+        packages.clone(),
+        registry.clone(),
+        validator.clone(),
+        events,
+        mcp,
+    );
+    let result = install
+        .execute(source.to_string_lossy().into_owned())
+        .await
+        .unwrap();
+    assert_eq!(result.plugin.id, "dev.idea.fixtures.missing-main");
+    assert_eq!(
+        result.plugin.lifecycle_state,
+        domain::PluginLifecycleState::Invalid
+    );
+    assert!(result
+        .plugin
+        .error
+        .as_deref()
+        .unwrap_or_default()
+        .contains("not servable"));
+
+    let catalog = ListPluginRuntimeContributions::new(packages, registry.clone(), validator)
+        .execute()
+        .await
+        .unwrap();
+    assert!(catalog.plugins.is_empty());
+    let admin = ListPlugins::new(
+        Arc::new(FsPluginPackageStore::new(&app_data)),
+        registry,
+        Arc::new(JsonPluginManifestValidator::new("0.3.0")),
+    )
+    .execute()
+    .await
+    .unwrap();
+    assert_eq!(
+        admin[0].lifecycle_state,
+        domain::PluginLifecycleState::Invalid
+    );
+    assert!(admin[0]
+        .error
+        .as_deref()
+        .unwrap_or_default()
+        .contains("not servable"));
+
+    let _ = fs::remove_dir_all(source);
+    let _ = fs::remove_dir_all(app_data);
+}