Ctrl+B keybinding conflicts with standard readline/emacs cursor movement

Summary

Claude Code recently added Ctrl+B as a keybinding for background tasks. This conflicts with the standard readline/emacs keybinding for moving the cursor backward one character, which has been the default behavior in Unix terminals for decades.

Impact

• Developers who rely on emacs-style keybindings (Ctrl+A, Ctrl+E, Ctrl+B, Ctrl+F, etc.) find their muscle memory broken
• Debugging this issue is time-consuming - it's not immediately obvious that Claude Code is intercepting the keystroke
• The workaround (creating ~/.claude/keybindings.json to unbind it) requires research to discover

Suggestion

Consider using a different keybinding for background tasks that doesn't conflict with standard terminal conventions. Alternatives could include:

• Ctrl+Shift+B
• Ctrl+Alt+B
• A different key entirely

Or at minimum, document this conflict prominently and consider not binding Ctrl+B by default.

Environment

• macOS terminal / VS Code integrated terminal
• Standard readline/emacs keybindings expected