feat(streaming): add streaming support to DriverAgent and DualAgentOrchestrator

- Add onToken callback option to IDualAgentOptions interface
- Add onToken property and setOnToken method to DriverAgent
- Wire up streaming in startTask and continueWithMessage methods
- Pass source identifier ('driver'/'guardian') to onToken callback

ts/smartagent.classes.dualagent.ts

@@ -181,9 +181,15 @@ export class DualAgentOrchestrator {
       : this.driverProvider;
 
     // NOW create agents with initialized providers
+    // Set up token callback wrapper if streaming is enabled
+    const driverOnToken = this.options.onToken
+      ? (token: string) => this.options.onToken!(token, 'driver')
+      : undefined;
+
     this.driver = new DriverAgent(this.driverProvider, {
       systemMessage: this.options.driverSystemMessage,
       maxHistoryMessages: this.options.maxHistoryMessages,
+      onToken: driverOnToken,
     });
     this.guardian = new GuardianAgent(this.guardianProvider, this.options.guardianPolicyPrompt);