Support Shift+Enter multi-line input in foot terminal

Summary

/terminal-setup does not recognize foot as a supported terminal for the Shift+Enter multi-line shortcut. However, foot already sends a distinct escape sequence for Shift+Enter: \e[27;2;13~ (modifyOtherKeys encoding: modifier 2 = Shift, key 13 = Enter).

Current behavior

Running /terminal-setup inside foot (via tmux or directly) does not list foot as a supported terminal. The message says:

iTerm2, WezTerm, Ghostty, Kitty, and Warp support Shift+Enter natively.

foot is not mentioned, even though it sends a unique sequence for Shift+Enter.

Expected behavior

Claude Code should recognize foot's \e[27;2;13~ Shift+Enter sequence and allow multi-line input, the same way it does for other terminals that send distinct Shift+Enter sequences.

Environment

• Terminal: foot 1.21.0
• Platform: Linux (Arch, sway)
• Shell: fish