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/examples/hello-plugin/src/index.ts

@@ -71,6 +71,13 @@ export function activate(ctx: ActivateContext): void {
   } else {
     ctx.logger.warn("layout registry unavailable", { layoutType: LAYOUT_TYPE });
   }
+
+  void ctx.services?.workspace.getCurrentProject().then((project) => {
+    ctx.logger.info("workspace service available", {
+      projectId: project?.id ?? null,
+      hasProjectRoot: Boolean(project?.root)
+    });
+  });
 }
 
 const plugin: IdeAPluginModule = {