fix: send appVersion in probe client hello and update it on session resume

buildClientConfig in test-daemon-connection.ts never set appVersion, so
probe clients (which become the live client) sent hello without it. The
daemon's version gate then hid Pi/Copilot from all these sessions.

Also update appVersion on the Session when a client reconnects with a
newer version, so stale sessions don't stay gated forever.

packages/server/src/server/session.ts

@@ -529,7 +529,7 @@ function toAgentPersistenceHandle(
  */
 export class Session {
   private readonly clientId: string;
-  private readonly appVersion: string | null;
+  private appVersion: string | null;
   private readonly sessionId: string;
   private readonly onMessage: (msg: SessionOutboundMessage) => void;
   private readonly onBinaryMessage: ((frame: Uint8Array) => void) | null;
@@ -714,6 +714,12 @@ export class Session {
     this.sessionLogger.trace("Session created");
   }
 
+  updateAppVersion(appVersion: string | null): void {
+    if (appVersion && appVersion !== this.appVersion) {
+      this.appVersion = appVersion;
+    }
+  }
+
   /**
    * Get the client's current activity state
    */

packages/server/src/server/websocket-server.ts

@@ -745,6 +745,11 @@ export class VoiceAssistantWebSocketServer {
         clearTimeout(existing.externalDisconnectCleanupTimeout);
         existing.externalDisconnectCleanupTimeout = null;
       }
+      const newAppVersion = message.appVersion ?? null;
+      if (newAppVersion && newAppVersion !== existing.appVersion) {
+        existing.appVersion = newAppVersion;
+        existing.session.updateAppVersion(newAppVersion);
+      }
       existing.sockets.add(ws);
       this.sessions.set(ws, existing);
       this.sendToClient(ws, this.createServerInfoMessage());