Add WG chatmodes for clean code and security

[warengonzaga]

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 node update-readme.js and verified that README.md is up to date.

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Description

I'm adding my personal custom chatmodes from my project here: https://github.com/wgtechlabs/github-copilot-chatmodes

I wanna share my custom chat modes here which I use heavily in my open source projects at WG Technology Labs.

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Type of Contribution

• New instruction file.
• New prompt file.
• New chat mode file.
• Other (please specify):

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Additional Notes

I follow my own format for the chatmodes, let me know if that's allowed. High level I wanna add a basic metadata to my chat modes so they can find where to check if there's any update to my chat modes.

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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 PR introduces two new WG Technology Labs chat modes—one for security reviews and another for clean-code transformations—and updates the main README to list them.

• Added wg-code-sentinel.chatmode.md for security-focused code reviews
• Added wg-code-alchemist.chatmode.md for clean-code and SOLID refactorings
• Updated README.md to include both new chat modes in the catalog

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
chatmodes/wg-code-sentinel.chatmode.md	New security-first chat mode with metadata & tools
chatmodes/wg-code-alchemist.chatmode.md	New clean-code transformation chat mode
README.md	Added entries for the two new WG chat modes