[BUG] 2.1.152 regression: arrow keys hijacked in prompt input (cursor cannot move down/left/right)

Summary

In 2.1.152, arrow keys (↓, ←, →) no longer work for cursor movement inside the multi-line prompt input box. They appear to be globally captured by what looks like a new \"manage subagents\" keyboard shortcut feature, leaving no way to move the cursor between lines in the prompt.

Repro

1. Install / upgrade to claude 2.1.152 (native installer, macOS arm64).
2. Open a new session in any terminal (verified in Ghostty 1.x; not terminal-specific — see diagnosis below).
3. Type a multi-line prompt (Shift+Enter for newline).
4. Try to move the cursor with ↓ / ← / →.

Expected: cursor moves character-by-character / line-by-line within the input box. Pressing ↓ on the last line should jump cursor to end of line (prior behavior).

Actual: arrow keys do nothing for cursor movement. ↓ in particular has no effect — cannot navigate between lines of a multi-line prompt at all.

Diagnosis (ruled out)

• Terminal is sending standard sequences: cat -v + ↓ prints ^[[B as expected.
• Not a TERM issue: tested with TERM=xterm-256color claude — same broken behavior.
• Not a system-level remap: no Karabiner, no hidutil mappings.
• Not a config issue: no ~/.claude/keybindings.json, and settings.json contains no key bindings.
• Same terminal, same env, codex CLI's input box handles ↓ correctly → confirms it's not the terminal or protocol layer; the regression is in Claude Code's input handler.
• Downgrading the symlink ~/.local/bin/claude to point at the 2.1.150 binary fully restores normal arrow-key behavior. Re-pointing it at 2.1.152 reproduces the bug. So the regression is contained to 2.1.152.

Suspected cause

2.1.152 appears to have introduced a feature where ← (and possibly ↑/↓/→) manages/navigates subagents at a global level. This handler seems to be running unconditionally and swallowing arrow events that should be delivered to the prompt input box. Suggested fix: only bind these arrows in the subagent management view, not in the prompt input focus.

Environment

• claude 2.1.152 (Claude Code), native installer, macOS arm64 (Darwin 24.6.0)
• Terminal: Ghostty (TERM=xterm-ghostty, also tested TERM=xterm-256color)
• Shell: zsh

Workaround

ln -sfn ~/.local/share/claude/versions/2.1.150 ~/.local/bin/claude

(Pin to 2.1.150, set \"autoUpdates\": false in settings.json to prevent re-upgrade.)