refactor: use satisfies OutgoingEvent instead of as const

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

Author: raman325

src/lib/forward.ts

@@ -19,6 +19,7 @@ import {
   dumpNode,
 } from "./state.js";
 import { ClientsController } from "./server.js";
+import { OutgoingEvent } from "./outgoing_message.js";
 import { NodeNotFoundError } from "./error.js";
 
 export class EventForwarder {
@@ -429,11 +430,11 @@ export class EventForwarder {
             }
           }
           return {
-            source: "node" as const,
+            source: "node",
             event: "metadata updated",
             nodeId: changedNode.nodeId,
             args,
-          };
+          } satisfies OutgoingEvent;
         });
       },
     );