prompt are not supported on .prompt.md files

[Arggon]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, or chat mode file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, or chat mode with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

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Type of Contribution

• New instruction file.
• New prompt file.
• New chat mode file.
• New collection file.
• Update to existing instruction, prompt, chat mode, or collection.
• Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

This pull request removes an unsupported prompts: field from the front matter of the dotnet-upgrade.prompt.md file and cleans up trailing whitespace throughout the document. The PR title indicates awareness that "prompt are not supported on .prompt.md files," addressing a metadata structure issue.

• Removal of the invalid prompts: field from the YAML front matter
• Cleanup of trailing whitespace on empty lines throughout the file
• Preservation of all content structure and formatting

[Copilot]

The name field should be replaced with a mode field. According to the prompt file guidelines, .prompt.md files must have a mode field specified with a value of either agent or ask.

[Arggon]

@copilot open a new pull request to apply changes based on this feedback. The 'mode' attribute has been deprecated. The 'agent' attribute is used instead.
agent: agent