The runbook span table, the phase-4 task list and the data reference all
conflicted: this branch had already expanded them with the open-phase,
avalanche and proposal-prefix attributes. Keep this branch's tables and
apply the close-time rename to their rows.
The close_time entry in ledger_history_mismatch_total{reason} is a metric
label value, not the span attribute, and is deliberately unchanged.
2b61e763f7