LGTM

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Pull Request Overview

This PR updates the CONTRIBUTING.md documentation to provide clearer guidance on AWS Lambda Layer version management. The update includes important notes about layer version immutability and adds verification steps to the release process.

• Added comprehensive notes explaining AWS Lambda Layer version immutability and deletion behavior
• Improved formatting and clarity of the layer release instructions
• Added a verification step to check layer version publication across regions

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

LGTM