fix: derive taskTitle from resolved finalTask, not just positional arg

When task comes from interactive prompt instead of CLI arg, taskTitle
was undefined. Now uses finalTask which captures all resolution paths.

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

Author: rubenmarcus

src/commands/run.ts

@@ -643,7 +643,7 @@ Focus on one task at a time. After completing a task, update IMPLEMENTATION_PLAN
     validate: options.validate ?? preset?.validate,
     validationWarmup,
     sourceType: options.from?.toLowerCase(),
-    taskTitle: sourceTitle || (task ? task.slice(0, 80) : undefined),
+    taskTitle: sourceTitle || (finalTask ? finalTask.slice(0, 80) : undefined),
     // New options
     completionPromise: options.completionPromise ?? preset?.completionPromise,
     requireExitSignal: options.requireExitSignal,