Notifications now use ExecStopPost (fires on success and failure) with
status-aware icons/messages instead of ExecStartPost (success only).
Desktop uses dialog-information/dialog-error, email uses sendmail.
Flags (i, e=addr) are persisted as # SYSTAB_FLAGS= comments in service
files and exposed in edit mode via ID:flags syntax. Edit mode validates
schedules before applying (re-edit loop like crontab -e). -S and -L
accept an optional job ID to filter to a single job. Extract trim()
helper to replace inline whitespace-stripping idiom.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
