Add SDD Pilot as an external toolkit

[attilaszasz]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• I have read and followed the Guidance for submissions involving paid services.
• My contribution adds a new instruction, prompt, agent, skill, or workflow 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, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.
• I am targeting the staged branch for this pull request.

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Description

Add SDD Pilot as an external toolkit

Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• 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

Adds SDD Pilot to the repository’s external plugin registry so it can appear in the generated plugin marketplace and website listings.

Changes:

• Append a new external plugin entry for attilaszasz/sdd-pilot to plugins/external.json
• Include metadata (description, version, keywords, repository/homepage, author, license)

[aaronpowell]

Sorry, at present we're only accepting external plugins from Microsoft/GitHub repos, and select partners.