Charge a delivered run that finished without being billed

For a run that is done with billed = 0: settles its ledger row at the price the run was admitted at and puts it back on the billing queue. This is the repair for a run whose finish failed and then succeeded on a later attempt — the failed attempt wrote a $0 ledger row on the id the successful one then collided with (FAULT 79). Cross-workspace and audited. Dry run unless apply=1. Idempotent: the settle never raises a row that already carries a charge, so a second call reports already_billed and writes nothing. A trial-covered run reports included and is left at $0. Nothing here computes or chooses a price.