Contract-to-cash pipeline (last / this / next month)

DARK — 404s unless ar_ap_items_enabled. months[3] each {key: YYYY-MM, label, contractedCents (active contracts' billable that month from cadence + per_invoice_cents), invoicedCents (non-void AR items issued that month), collectedCents (ar_item_payments in the month)}; plus totals across the three months, activeContractCount and totalContractedCents. The envelope carries currency and minorUnitExponent (null/null only when every returned monetary aggregate is empty).