Add 'Oracle-to-PostgreSQL' Custom Agent and Associated 'o2p-dbmigration' Skill

[PrimedPaul]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, or skill 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, or skill with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

The Oracle-to-PostgreSQL Migration Expert (dbmigration-expert) is a custom GitHub Copilot agent that orchestrates Oracle-to-PostgreSQL application migrations for multi-project .NET solutions. It operates as a hierarchy of specialized subagents coordinated by a central router, with a companion skill that encodes institutional knowledge about Oracle/PostgreSQL behavioral differences.

The agent is designed to:

• Discover all projects in a .NET solution and assess Oracle migration eligibility.
• Migrate application codebases one project at a time, preserving originals untouched.
• Run closed-loop integration testing with automatic retry and bug reporting.
• Persist progress to disk so work survives token-limit boundaries and can resume across sessions.
• Generate a final migration report aggregating outcomes from all projects.

Oracle-to-PostgreSQL DB Migration Expert Design.md

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• Update to existing instruction, prompt, agent, plugin, or skill.
• Other (please specify):

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Additional Notes

I am a developer working on an enterprise Oracle to Postgres legacy application migration effort. I use and refine this agent on a regular basis. I welcome all contributions.

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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.

[PrimedPaul]

Resolving errors before re-submission.