CONV-325: document credits balance endpoint

[menvil]

Adds test for CONV-325.

🤖 Generated with Claude Code

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Summary by cubic

Add a test to ensure the OpenAPI spec documents the credits balance endpoint at /credits/balance with a GET operation. Aligns with Linear CONV-325 by verifying the endpoint is present in the API docs to prevent regressions.

^{Written for commit 77eef4d. Summary will update on new commits.}

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