fix(todo): repoint the broken signel link and close the org-lint follow-ups

The Signal task linked to a todo file in the old signel checkout, which no longer exists. I repointed it to the smoke project's todo (smoke is the evolved Signal package). I also reworded the bug-capture task's prose so its quoted TODO-heading strings stop tripping the misplaced-heading checker. A full org-lint pass now reports zero, so the follow-up task is closed.

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