docs(todo): split signel manual-verify into discrete checkable tasks

The earlier checklist was one sub-header with all the steps in a single bullet list, which means a partial walk-through can't be marked done piece by piece. Per the manual-testing convention, one sub-header per scenario is the format that lets a failing step promote cleanly to its own bug.

I split the original entry into 9 sub-headers, one per scenario, each with a "What we're verifying" line, the exact key chords or commands, and a single Expected outcome. The set covers connect, picker opens with names, send-a-message, Note-to-Self via the direct command (the spec's D3 critical check), Note-to-Self via the pinned picker entry, the clobber-fix survival test, dashboard, stop, and refresh.

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