CronCreate confirmation message incorrectly states 7-day expiry (actual is 3 days)

Bug Report

Description:
The CronCreate tool confirmation message says:

"Auto-expires after 7 days."

However, the scheduled tasks documentation clearly states under Three-day expiry:

"Recurring tasks automatically expire 3 days after creation."

Impact:
This discrepancy in the tool confirmation message causes Claude to give users incorrect information about task expiry, which can lead to:

• Renewal jobs being scheduled too infrequently (e.g. every 6 days instead of every 2)
• Users’ scheduled tasks silently expiring before expected

Expected behavior:
The CronCreate confirmation message should say "Auto-expires after 3 days" to match the documented behavior.

Suggested fix:
Update the confirmation message returned by CronCreate from 7 days to 3 days.