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/README.md

@@ -8,6 +8,7 @@ It exercises the current plugin primitives end to end:
 - menu entry: `hello-plugin`;
 - command: `hello-plugin`, returning `hello-world`;
 - layout contribution: `hello-plugin.hello-world`, rendered as `hello-world`.
+- tooling capability: logs the focused workspace project when `ctx.services` is available.
 
 ```sh
 npm run typecheck:examples
@@ -25,6 +26,7 @@ During activation the plugin logs:
 - whether the command and layout runtime registries are available;
 - successful registration of the `hello-plugin` command;
 - successful registration of the `hello-plugin.hello-world` layout;
+- availability of the workspace service from the `tooling` runtime capability;
 - the first layout render, including project/node identifiers.
 
 These messages are intentionally small and stable so installation, bundle import, activation and