CONV-321: document conversion cost estimate endpoint

[menvil]

Adds test for CONV-321.

🤖 Generated with Claude Code

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Summary by cubic

Adds a test to verify the OpenAPI spec documents the conversion cost estimate endpoint at /conversions/estimate with a POST method. Supports CONV-321 and prevents regressions in API docs.

^{Written for commit f5ffc65. Summary will update on new commits.}

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