[Senate] Triage 30 open governance decisions for vote readiness done

← Senate
30 rows in `governance_decisions` have status='open' or 'proposed' and have not advanced to voting. For each: check if required_approvals have been received, verify the artifact it targets still exists (using artifact_registry.resolve_artifact()), check if the decision type (archive/deprecate/merge/promote) is still valid given current artifact state. Mark decisions as 'ready_to_vote', 'resolved', or 'stale' accordingly. Update status via POST /api/governance/decisions/{id}/advance. Acceptance: 30 decisions triaged, none left in ambiguous 'proposed' state without a next-step status.

Completion Notes

Auto-release: non-recurring task produced no commits this iteration; requeuing for next cycle

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