When a scheduled shift ends and the employee is still clocked in after a configurable grace period, fire a trigger.

Same logic pattern as the existing 'employee late for shift' (late clock-in) trigger, mirrored for clock-out: shift ends → X minutes pass → employee hasn't clocked out → trigger fires.

Use case (UK compliance / lone worker safety): If an employee working alone doesn't clock out after their shift, notify the employee to clock out and notify admin/manager to follow up.

Requested by Alan Gamboa-Saucedo in #automations-feedback.