CONV-319: document file upload endpoint

[menvil]

Adds test for CONV-319.

🤖 Generated with Claude Code

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Summary by cubic

Adds an OpenAPI test that verifies the file upload endpoint is documented at /files with a POST operation, fulfilling CONV-319. This guards against missing or regressed API docs for uploads.

^{Written for commit cdd5001. Summary will update on new commits.}

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