Add Yaw Terminal to terminal config docs

Yaw is a cross-platform terminal (Windows, macOS, Linux) with built-in support for Claude Code — it auto-detects when you launch Claude Code and opens a split-pane layout with the AI tool on the left and a regular terminal in the same directory on the right.

It also has a built-in file editor, SSH client, connection manager, and AI assistant with Claude API support.

Yaw supports Shift+Enter natively and would be a good addition to the terminal setup page at code.claude.com/docs/en/terminal-config.

Website: https://yaw.sh/terminal