feat(pager): add agent-page, the runtime-neutral phone pager

The Signal pager reconcile found one pager identity, registered in velox's signal-cli, reachable from other machines only by hand-rolled ssh. agent-page wraps that: direct signal-cli on velox, ssh relay over the tailnet from everywhere else, a desktop-fallback hint when the relay fails, and the UUID target baked in so nobody pages the unregistered phone number again. Four bats tests stub ssh/uname/signal-cli to verify command construction; the real path was verified with a live phone push today. protocols.org's Paging Craig section now teaches both channels (notify for the desk, agent-page for the phone) and demotes signal-mcp to a velox-local nicety; page-me.org, work-the-backlog, and the INDEX carry the same two-channel story. Every project inherits on its next startup sync and make install.

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