Set an alarm on a task item

[tomzx]

Background

Some tasks should remain in the sleep state until a specific point in time, after which they become actionable again. Today, sleeping a task removes it from the active view but there is no built-in way to have it automatically wake up at a chosen time. Users currently have to remember to revisit sleeping tasks manually, which defeats the purpose of deferring work to a known future moment (e.g., "follow up next Monday morning", "revisit after the meeting at 3pm", "wait until the deadline approaches").

Adding an alarm/wake-up time to a task would let users confidently defer work, knowing the task will resurface at the right time without manual tracking.

Version

main @ fe6d096

Acceptance Criteria

• A user can set an alarm (a specific date/time) on a task, either when sleeping it or as a separate action.
• A user can view, edit, and clear the alarm on a task.
• When the alarm time is reached, the task automatically transitions out of the sleep state and becomes actionable again.
• Tasks with an alarm display the scheduled wake-up time in the UI/CLI output.
• Alarm times are persisted across application restarts.
• Behavior is defined and documented for alarms whose scheduled time is in the past when the app starts (e.g., wake immediately).

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Created with create-issue (e6796d9)