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/registry.ts

@@ -19,7 +19,15 @@ import type {
   PluginMenuItemContribution,
   PluginTopLevelMenuContribution,
 } from "@/domain";
-import type { AgentGateway, GitGateway, ProjectGateway, SystemGateway, TerminalGateway } from "@/ports";
+import type {
+  AgentGateway,
+  FocusedProjectGateway,
+  GitGateway,
+  ProjectGateway,
+  SystemGateway,
+  TerminalGateway,
+  WorkStateGateway,
+} from "@/ports";
 
 /** The stable gateways a plugin's `activate(ctx)` is allowed to reach (carnet §6). */
 export interface PluginGatewaySet {
@@ -28,6 +36,8 @@ export interface PluginGatewaySet {
   terminal: TerminalGateway;
   agents: AgentGateway;
   system: SystemGateway;
+  workState: WorkStateGateway;
+  focusedProject: FocusedProjectGateway;
 }
 
 /** A disposable handle returned by every `register*` call. */