P3: Add scheduled task / cron enumeration tool (MITRE T1053)

[Shreyas582]

Description

Scheduled tasks / cron jobs are one of the most common persistence mechanisms (MITRE T1053). The current check_persistence tool does basic detection but does not enumerate scheduled tasks in detail.

On Windows, schtasks /query is needed; on Linux, crontab -l plus /etc/cron.* directories.

Proposal

Add a list_scheduled_tasks tool that:

1. On Windows: runs schtasks /query /fo CSV /v and parses results
2. On Linux: reads crontab -l for all users + /etc/cron.* directories
3. Flags tasks with suspicious characteristics (running as SYSTEM, recently created, pointing to temp dirs)
4. Returns structured output with task name, schedule, command, user, status

Affected Files

• cyber_tools/src/lib.rs (new tool)
• core_engine/src/lib.rs (tool registry, priv-esc-review template)