🧹 [Extract standard library HTTP registry exports]

[Tcode-Motion]

• 🎯 What: Extract a helper macro execute_request! to handle HTTP requests in the standard library.
• 💡 Why: Reduces significant code duplication across GET and POST functions for capability checking and response handling.
• ✅ Verification: Re-ran cargo check and cargo test on the stdlib to ensure the macro replacement is sound. The remaining build errors are known pre-existing issues unrelated to this task.
• ✨ Result: Improved codebase readability and maintainability without changing behavior.

---

PR created automatically by Jules for task 4764823193596552876 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.