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/manifest.js

@@ -59,8 +59,8 @@ function validateCapabilities(value, errors) {
         return;
     }
     value.forEach((capability, index) => {
-        if (capability !== "ui" && capability !== "mcp") {
-            errors.push(`capabilities[${index}] must be "ui" or "mcp"`);
+        if (capability !== "ui" && capability !== "mcp" && capability !== "tooling") {
+            errors.push(`capabilities[${index}] must be "ui", "mcp" or "tooling"`);
         }
     });
 }