[Tcode-Motion]

🎯 What: Extracted parse_yaml and stringify_yaml helper callbacks from register_yaml in stdlib/src/yaml.rs and added unit tests.
💡 Why: Reduces the length and complexity of register_yaml, improving code readability, maintainability, and unit testability.
✅ Verification: Verified with cargo fmt --all -- --check and cargo test --workspace --all-targets.
✨ Result: Cleaned up register_yaml implementation into smaller modular functions and improved test coverage.

---

PR created automatically by Jules for task 2737333721354466311 started by @Tcode-Motion

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.