fix: do not count normal dispatcher exits as crashes

The close handler called recordCrash() unconditionally, even for exit
code 0 (normal MAX_REQUESTS restart). After 5 normal cycles within 60s
the dispatcher was permanently disabled. Now only non-zero exits count.

packages/ai/src/bridge.ts

@@ -216,12 +216,14 @@ function startDispatcher(): ChildProcess | null {
       dispatcherReady = false;
     });
 
-    child.on("close", () => {
+    child.on("close", (code) => {
       for (const [id, req] of pendingRequests.entries()) {
         req.reject(new Error("Python dispatcher exited unexpectedly"));
         pendingRequests.delete(id);
       }
-      recordCrash();
+      if (code !== 0) {
+        recordCrash();
+      }
       dispatcher = null;
       dispatcherReady = false;
     });