CLAUDE.md@bench/judge/corpus/governance-repo/services/billing git:20261016.7bc6b88A

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# Billing service

- Amounts are integer cents; NEVER use floating point for money.
- Every refund or charge call MUST pass an `idempotency_key`.
- A command that changes balances MUST be run with `--dry-run` first and the result shown to the user.