Add multiplayer-ai to Remote Access

[godfaddaai]

Summary

Adds godfaddaai/multiplayer-ai to Remote Access using the required one-line description and live star badge.

Why it fits

• Directly integrates with Codex CLI sessions: a trusted teammate can list, read, follow, and add an attributed turn to an explicitly shared existing session.
• Uses Tailscale for private transport and identity while the host retains execution authority and session-level access control.
• Free, MIT-licensed, no signup, and actively maintained; the current macOS public alpha is v0.4.10.
• Distinct from the existing single-user phone/web remotes: this is named teammate collaboration across two terminals.

Checks

• git diff --check
• Project link returns HTTP 200
• Shields.io star badge returns HTTP 200
• Confirmed no existing multiplayer-ai / mpai entry or PR

Disclosure: I maintain the submitted project.