feat(FN-3507): block dispatch when project lacks node mapping

Adds validation to block task dispatch when no project-node mapping exists (FN-3507), including a read helper in CentralCore and a new `node-dispatch-validation` module integrated into the scheduler and in-process runtime, with test coverage across routing and validation scenarios.

Fusion-Task-Id: FN-3507

packages/engine/src/runtimes/in-process-runtime.ts

@@ -38,6 +38,7 @@ import { MissionAutopilot } from "../mission-autopilot.js";
 import { MissionExecutionLoop } from "../mission-execution-loop.js";
 import { TriageProcessor } from "../triage.js";
 import { EphemeralWorkerManager } from "../ephemeral-worker-manager.js";
+import { validateProjectNodeMapping } from "../node-dispatch-validation.js";
 
 /**
  * InProcessRuntime runs a project within the main process.
@@ -300,6 +301,10 @@ export class InProcessRuntime
           runtimeLog.log(`Scheduled task ${task.id}`);
         },
         onBlocked: () => {},
+        validateNodeDispatch: async (nodeId) => {
+          const mappedPath = await this.centralCore.getProjectNodePath(this.config.projectId, nodeId);
+          return validateProjectNodeMapping({ nodeId, mappedPath });
+        },
 
       });