Review and cancel the wakeups scheduled for this session.

Use this tool to:
- List the wakeups you scheduled, with their id, due time, and reason (or the scheduled prompt when you gave no reason)
- Cancel a wakeup you no longer need, by its id

Call it with action "list" first to find the id, then action "cancel" with that id.
Cancelling an id that is already gone is safe: the tool reports it and does not fail.
In a session goal, a wakeup the goal waits for suspends the goal until it fires; cancelling it resumes the goal with a goal turn, or settles it with a reason the user can read.

Do NOT use this tool:
- As a poll loop while waiting — the harness wakes you when the wakeup fires
- To cancel a wakeup that has already fired — it is gone, and the cancel is a no-op
