feat(page-signal): route pages through a dedicated Signal pager account

Paging never actually reached the phone before. signal-cli was registered as my primary number, so a page was that account messaging itself, and Signal mobile doesn't push-notify a self-message. I registered signal-cli with a separate Google Voice number (profile "Claude Pager") and pointed everything at it. page-signal now sends from that account to my Signal account by default, so a page lands as a normal third-party message and rings the phone.

The old --note-to-self default is gone, since note-to-self on the pager account wouldn't reach me. Sender and default recipient now come from PAGE_SIGNAL_ACCOUNT and PAGE_SIGNAL_TO with baked-in defaults. The send command pins the sender with -a, and --to also accepts a Signal account UUID, since my account hides its phone number. servers.json points signal-mcp at the new number. Verified end-to-end: live sends from the pager account notified the phone, and signal-mcp shows connected.

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