Cron-like task scheduler

[niteshpurohit]

Type: Task
Parent Issue: #423

Summary

In-process task scheduler with cron syntax support, delayed execution, and recurring jobs

Scope

In-process task scheduler with cron syntax support, delayed execution, and recurring jobs

Not In Scope

• Distributed job scheduling
• Job persistence

Acceptance Criteria

• Scheduler supports cron syntax
• Delayed execution
• Recurring jobs
• Tests verify scheduling behavior
• Documentation with cron syntax guide

C++ Native Library: No