feat(triage): add a per-sweep timestamp to auto mode output

Auto-mode sweeps now end with the date, time, and timezone on their own final line, so an away reader gauges each summary's freshness at a glance without computing it. The stamp prints on every sweep, including a quiet "no changes" one — there the stamp is the proof the loop ran.

Same-day addendum to the work-project auto-mode proposal.

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