feat(notify): default page notifications to --persist

I default page notifications to --persist so a page that fires while I'm away from the desk waits for me instead of auto-dismissing after a few seconds.

page-me and status-check already persisted every page. I added --persist to the rest: the alarm, reminder, and meeting-alert examples in protocols.org, the long-running-process completion ping, and the cross-agent-watch message notification. I documented --persist as the default for any page meant to get attention, with a low-value informational ping as the only exception.

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