feat(completion): annotate the Signal and contact pickers via categories

Two pickers have bare-name candidates worth a category: the Signal recipient picker, where a name maps to a phone or UUID, and org-contacts find, where a name maps to an email. I tag each with a custom category and a table annotation-function that shows the looked-up value. marginalia has no annotator for these custom categories, so it leaves the table's annotation in place. The other Tier-2 candidates from the survey (ai-term projects, the mu4e contact list) already carry their info inline, so a category adds nothing and I left them bare.

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