docs(repo): add .agents skills placeholder

[dackers86]

Summary

• add a tracked placeholder for .agents/skills/
• create the repository location for future agent skills
• keep the initial PR intentionally empty aside from the placeholder file

Test plan

• Docs-only change

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request establishes the initial directory structure for future agent skills within the repository. By adding a placeholder file, the directory is now properly tracked, setting the stage for upcoming development without introducing functional code changes at this time.

Highlights

• Repository Structure: Added a new directory structure for agent skills.
• Placeholder File: Included a .gitkeep file to ensure the new directory is tracked in version control.

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[gemini-code-assist]

Code Review

This pull request adds a .gitkeep file to the .agents/skills/ directory to ensure the directory is tracked by version control. I have no feedback to provide as there were no review comments and the change is a standard practice for maintaining directory structures.