v2.13.12

• fix(security): harden auth guards and scheduled credentials 0c09c57
• fix(backups): cap and stagger daily backup uploads 50f1557
• fix(imap): recover legacy MIME trees and harden reboot policy c87db9b
• fix(sqlite): safe cross-process VACUUM/rekey file swap to prevent SQLITE_CORRUPT 47ff817
• fix(push): stop draft and sent saves from alerting 212fb0c
• fix(push): only send user-visible alerts for new mail d7c5ff1

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v2.13.11...v2.13.12