Billing accounts, terms and enterprises; g1t is no longer free
Every workspace is paid for by a billing account: its own by default, or an enterprise's, which pays for several workspaces with one limit and one set of terms, as GitHub Enterprise does. Terms are standard, comped (nothing charged, usage recorded; paid features on) or custom (a discount, a ceiling, an end date). syntaqx is comped by migration rather than an exempt list. Staff methods (admin_*) back sudo.g1t.sh, and every change is kept in admin_actions with who made it. FREE_WHILE_BUILDING is off: usage is charged on the account's terms. The free allowance on hosted models now covers its share of a run's cost rather than everything. Prepaid credit no longer gates work; usage limits do, and credit is a prepayment. So that limits stop non-payers without stopping payers: near the limit a workspace with a card on file is charged for what it owes (live payments only), which lowers what is owed and raises the limit. A declined card stops work until it is paid; an owner's own spend limit still means stop.
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