fix: delete falsy referenced properties in endpoint generator

[kskszq]

Pull Request

Description

When a nested reference resolves to a falsy value, the endpoint documentation generator calls .pop() on a plain properties object and throws TypeError: temp.properties.pop is not a function. Use delete temp.properties[key] to remove that property, and forEach for the traversal whose return value is unused.

Checklist

• My changes follow the existing code style (two changed lines).
• Reproduced the reported failure before the fix and verified the same resolver checks pass afterward.
• Checked leaf schemas, nested references, and preservation of sibling properties when removing a falsy reference.
• JavaScript syntax check and git diff --check pass.
• Prettier 3.0.0 formatting check passes.
• Maintainer review is pending.

Additional Notes

Validation uses a small local Node.js harness that executes the existing resolveRef function with a controlled $refs.get implementation. The failing fixture returns false; this verifies the existing falsy-removal branch, not end-to-end parsing of an invalid OpenAPI document. The full website build and documentation generation have not been run. This does not add recovery for missing references rejected by the OpenAPI parser.

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References, Fixes and Closes

Fixes #133

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