Function validate_unit_id 

pub fn validate_unit_id(id: &str) -> Result<(), Error>

Validate a unit ID to prevent path traversal attacks.

Valid IDs match the pattern: ^[a-zA-Z0-9._-]+$ This prevents directory escape attacks like “../../../etc/passwd”.

Examples

• “1” ✓ (valid)
• “3.2.1” ✓ (valid)
• “my-task” ✓ (valid)
• “task_v1.0” ✓ (valid)
• “../etc/passwd” ✗ (invalid)
• “task/../escape” ✗ (invalid)