Document .NET 11 Happy Eyeballs considerations for future C# WebSocket clients

[Codex]

Description

Added a concise note in architecture docs about .NET 11’s ConnectAlgorithm.Parallel (Happy Eyeballs) for dual-stack WebSocket dialing and guidance for any future C# client adoption.

Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🎨 Style/UI update (no functional changes)
• ♻️ Refactoring (no functional changes)
• ⚡ Performance improvement
• ✅ Test update
• 🔧 Build/CI update

Related Issues

Closes #

Changes Made

• Noted .NET 11 Happy Eyeballs support in Socket.ConnectAsync and its relevance to WebSocket dialing.
• Clarified there is no current .NET client impact but future C# clients should opt into the parallel algorithm.
• Linked release notes for quick reference.

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All tests passing locally

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Screenshots / Demo

Additional Context

Original prompt

---

This section details on the original issue you should resolve

<issue_title>[Research]: Investigate potential benefits to .NET 11 Websocket Happy Eyes support</issue_title>
<issue_description>### Problem or motivation

https://github.com/dotnet/core/blob/main/release-notes/11.0/preview/preview1/libraries.md#happy-eyeballs-support-in-socketconnectasync

Determine if there may be benefits to the Synckit C# implementation of this upcoming .NET 11 preview 1 improvement.

Proposed solution

(Research only)

Alternatives considered

No response

Feature area

Core SDK

Contribution

• I'd be willing to submit a PR for this feature

Additional context

No response</issue_description>

Comments on the Issue (you are @codex[agent] in this section)

• Fixes [Research]: Investigate potential benefits to .NET 11 Websocket Happy Eyes support #3