Assisted-by: Claude Opus 4.6 via pi

diff --git a/.config/tmux/tmux.conf b/.config/tmux/tmux.conf
index c3be854e..d393de2b 100644
--- a/.config/tmux/tmux.conf
+++ b/.config/tmux/tmux.conf
@@ -25,6 +25,7 @@ set -g automatic-rename on
 set -g mode-keys vi
 set -ga terminal-features "*:hyperlinks" # osc 8
 set -g extended-keys on
+set -g extended-keys-format csi-u # pi
 
 # copy and paste
 bind -T copy-mode-vi 'v' send -X begin-selection