feat(sdk,plugins): ajoute capability tooling et services runtime publics (workspace/terminal/tasks)

- capability manifeste tooling supportée backend + transport runtime catalog
- ctx.services publique côté SDK/runtime, gated par tooling
- surface honnête: workspace, terminal, et tasks en observation/contrôle uniquement
- docs/exemple/tests mis à jour
- QA PASS sur feature/sdk-plugin-tooling-build-debug-surface

sdk/IdeaSDK/src/index.ts

@@ -17,7 +17,19 @@ export type {
   CommandDisposable,
   CommandHandler,
   CommandRegistry,
+  BackgroundTaskOutputAttachment,
+  BackgroundTaskRetryResult,
+  BackgroundTaskService,
+  BackgroundTaskStatus,
   IdeAPluginModule,
   PluginLogger,
-  PluginStorage
+  PluginServices,
+  PluginStorage,
+  TerminalOpenOptions,
+  TerminalReattachOptions,
+  TerminalReattachResult,
+  TerminalService,
+  TerminalSession,
+  WorkspaceProject,
+  WorkspaceService
 } from "./runtime.js";