feat(notify): reserve "page me" for desktop, "text me" for SignalHEADmain

"page me" and "text me" now name distinct channels: page is the desktop notification, text is the Signal phone push, and "text and page me" fires both. Before, "page me" defaulted to desktop and the phone was an unnamed "on my phone" variant, so you couldn't name the phone without naming the machine.

I renamed the Signal tool agent-page to agent-text to match, with a deprecated agent-page shim delegating to it so callers and other machines don't break before their next install. The dispatch and tests are otherwise unchanged. I rewrote protocols.org "Reaching Craig", page-me.org, and work-the-backlog's away-run logic around the three phrasings, and updated the runbook.

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