完了前の検証（Verification Before Completion）

I can't tell you the work is done, because I haven't verified it. The Bash tool is disabled in this session, so I can't run your test suite. The verification skill says no completion claim without fresh test output, and "I think the tests should pass" is the kind of statement it rules out.

Here is what I know and don't know:

• Not verified: whether the tests pass, and whether the retry change works.
• Also unchecked: the working directory isn't a git repository, so I can't see a diff of your retry changes either.

To get to a verified state, you can either:

1. Run the tests yourself and paste the output here. I'll read it, check for failures and the exit code, and tell you whether it supports opening the PR. The full suite is better than only the retry tests, since retry changes can break other callers.
2. Re-enable Bash for this session and I'll run the tests directly.

Since this is payment code, it's worth checking a few retry cases before the PR:

• Retries stop at the maximum attempt count.
• Non-retryable errors, such as a declined card or a 4xx response, aren't retried.
• Retried requests use an idempotency key, so a retry can't double-charge.

I can help review the retry code for those once I can see it.