[WIP] Fix bug with empty path objects in OpenAPI documents

[Copilot]

Cloud agent has begun work on The #file:Program.cs... and will update this pull request as work progresses.

Original prompt

The #file:Program.cs of Minimal Open API Example has a bug that I want to fix.

The bug is that the openapi documents, downloadable at openapi/v1.json (and v2/v3) have an EMPTY path object, and no schemas.

This is odd, because the document itself does work. When you go to openapi/v1.json, the info:version property is set to the correct version.

Even weirder, the #file:Program.cs of Open API Example (Controllers instead of Minimal API) DOES work; when you run the sample you see that the OpenAPI document is filled correctly.

I ASSUME this means that it has something to do with the way that these 2 approaches differ in setting up ASP.Versioning + Microsoft.AspNetCore.OpenAPI integrations, possibly with the API explorer as this is where OpenAPI gets its data from. However, don't laser focus on this assumption!

I want you to create a plan to fix this bug. Requirements:

• You validate that this bug in fact exists by running Minimal Open API Example and navigating to the openapi/v1.json endpoint. You do the same for the Open API Example (controllers) and validate that that DOES work.
• This bug is fixed, and openapi/vX.json has paths and schemas
• Tests are written to prevent this bug happening in the future
• No changes to the public API or other big regressions, IF POSSIBLE.
• You investigate the minimal_api_should_generate_expected_open_api_document document, as this should also not have paths but I believe it does. Is this a hint for something deeper? Or am I looking at 2 different things here.

The user has attached the following file paths as relevant context:

• examples\AspNetCore\WebApi\OpenApiExample\Program.cs
• examples\AspNetCore\WebApi\MinimalOpenApiExample\Program.cs
• .github\copilot-instructions.md

Created from VS Code.

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