[WIP] Protect master branch and configure Copilot agent

[Copilot]

Setting up branch protection and Copilot agent for automatic PR reviews

Plan:

• Create .github directory structure
• Add GitHub Actions workflow for CI/CD checks (tests, linting)
• Add GitHub Actions workflow for Copilot agent PR reviews
• Create Copilot instructions file for PR reviews
• Add CODEOWNERS file for additional protection
• Document branch protection settings that need to be enabled in GitHub UI
• Test the workflows locally if possible

Notes:

• Branch protection rules themselves must be configured in GitHub repository settings UI
• We'll create the necessary workflows and files to support branch protection
• Copilot agent reviews can be automated via GitHub Actions

Original prompt

Help me protect the master branch and setup up copilot agent for automatic pull request reviews

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