Credits didn't refund

Refund happens inside the inline runner when a job transitions to failed or cancelled. If you see a failed job but balance didn't move back:

1. Check /v1/billing/ledger — look for a reason: refund row with ref_id = your job id.
2. If that row exists, balance is correct — you're probably comparing against a cached top-nav balance. Refresh.
3. If the row is missing, file a support ticket with the job id; we'll reconcile manually (rare edge case).