docs(todo): add manual-verification checklist for the signel initiate-message workflow

I shipped the picker, daemon guard, cache, keymap, and clobber fix as unit-tested code (commits 4daf2328 here, 4740d97 and 5ec56c0 in the signel fork). The unit tests cover branches and contracts but can't exercise a real signal-cli daemon against a linked phone. This checklist captures the live verification I'll walk through on my next restart of Emacs.

Each step lists the exact command or key, the expected observable outcome, and (implicitly) the failure signal: any deviation gets logged under the failing step and promoted to a TODO bug, per the verification convention.

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