Step 329: Routing RPC + MCP Tools (12/12 tests)

4 new RPC methods and MCP tools for routing and worker dispatch:
routeTask, routeAllReady, executeTask, getRoutingExplanation.
Template workers auto-approve getter/setter patterns.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

editor/src/HeadlessEditorState.h

@@ -39,6 +39,9 @@
 #include "SkeletonAST.h"
 #include "WorkflowState.h"
 #include "WorkflowPersistence.h"
+#include "RoutingEngine.h"
+#include "WorkerRegistry.h"
+#include "ContextAssembler.h"
 
 #include <nlohmann/json.hpp>
 #include <string>
@@ -137,6 +140,9 @@ struct HeadlessEditorState {
     std::string          defaultLanguage = "python";
     bool                 verbose = false;
     std::optional<WorkflowState> workflow;
+    RoutingEngine        routingEngine;
+    WorkerRegistry       workerRegistry = WorkerRegistry::getDefaultRegistry();
+    ContextAssembler     contextAssembler;
 
     // --- Buffer access ---