revert(tui): temporarily undo Zellij Kitty-query bypass

This reverts 3929e0c181.

The Zellij-specific Kitty-query skip regresses Shift+Enter newline handling in Zellij. Restoring the previous behavior for now while we work on a safer fix that preserves both Alt and modified Enter handling.\n\nContext: https://github.com/badlogic/pi-mono/issues/3259

packages/coding-agent/CHANGELOG.md

@@ -49,7 +49,6 @@
 - Fixed the `plan-mode` example extension to allow `eza` in the read-only bash allowlist instead of the deprecated `exa` command ([#3240](https://github.com/badlogic/pi-mono/pull/3240) by [@rwachtler](https://github.com/rwachtler))
 - Fixed `google-vertex` API key resolution to treat `gcp-vertex-credentials` as an Application Default Credentials marker instead of a literal API key, so marker-based setups correctly fall back to ADC ([#3221](https://github.com/badlogic/pi-mono/pull/3221) by [@deepkilo](https://github.com/deepkilo))
 - Fixed RPC `prompt` to wait for prompt preflight success before emitting its single authoritative response, while still treating handled and queued prompts as success ([#3049](https://github.com/badlogic/pi-mono/issues/3049))
-- Fixed Alt keybindings inside Zellij by skipping the Kitty keyboard protocol query there and enabling xterm `modifyOtherKeys` mode 2 directly ([#3163](https://github.com/badlogic/pi-mono/issues/3163))
 - Fixed `/scoped-models` reordering to propagate into the `/model` scoped tab, preserving the user-defined scoped model order instead of re-sorting it ([#3217](https://github.com/badlogic/pi-mono/issues/3217))
 - Fixed `session_shutdown` to fire on `SIGHUP` and `SIGTERM` in interactive, print, and RPC modes so extensions can run shutdown cleanup on those signal-driven exits ([#3212](https://github.com/badlogic/pi-mono/issues/3212))
 - Fixed screenshot path parsing to handle lower case am/pm in macOS screenshot filenames ([#3194](https://github.com/badlogic/pi-mono/pull/3194) by [@jay-aye-see-kay](https://github.com/jay-aye-see-kay))

packages/coding-agent/docs/terminal-setup.md

@@ -32,12 +32,6 @@ If you want `Shift+Enter` to keep working in tmux via that remap, add `ctrl+j` t
 }
 ```
 
-## Zellij
-
-Pi detects Zellij automatically and skips the Kitty keyboard protocol query there.
-Zellij currently forwards that query to the outer terminal but still sends Alt as legacy ESC-prefixed sequences, which can break Alt keybindings if applications enable Kitty mode.
-Pi uses xterm `modifyOtherKeys` mode 2 inside Zellij instead, so no extra Zellij config is required.
-
 ## WezTerm
 
 Create `~/.wezterm.lua`: