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

frontend/src/plugins/runtime/loader.ts

@@ -25,6 +25,7 @@ import {
   type LoadedPlugin,
   type PluginGatewaySet,
 } from "./registry";
+import { createPluginServices, type PluginServices } from "./services";
 
 export type { PluginGatewaySet } from "./registry";
 
@@ -37,6 +38,7 @@ export interface IdeaPluginContext extends PluginGatewaySet {
   commands: PluginCommandContext;
   layouts: PluginLayoutRegistry;
   menu: PluginMenuRegistry;
+  services?: PluginServices;
 }
 
 export interface PluginActivation {
@@ -177,6 +179,10 @@ function normalizeContributes(entry: PluginRuntimePlugin): PluginContributionDto
   };
 }
 
+function hasCapability(entry: PluginRuntimePlugin, capability: string): boolean {
+  return arrayOrEmpty<string>(objectOrEmpty(entry).capabilities).includes(capability);
+}
+
 async function disposeAll(disposables: Disposable[], activation?: void | PluginActivation): Promise<void> {
   try {
     await activation?.dispose?.();
@@ -247,6 +253,9 @@ async function loadOne(
       menu,
       ...gateways,
     };
+    if (hasCapability(entry, "tooling")) {
+      ctx.services = createPluginServices(gateways);
+    }
 
     activation = await withTimeout(
       Promise.resolve(mod.activate(ctx)),