[BUG] Custom keybindings.json not working on Windows Terminal (PowerShell 7)

Bug Description

Custom keybindings defined in ~/.claude/keybindings.json are not applied when running Claude Code in Windows Terminal with PowerShell 7.

Keybindings Configuration

{
  "Enter": "newline",
  "Ctrl+Enter": "submit"
}

Expected Behavior

• Enter should insert a newline
• Ctrl+Enter should submit the message

Actual Behavior

Custom keybindings are ignored; default behavior is used instead.

Environment

• OS: Windows 10
• Terminal: Windows Terminal
• Shell: PowerShell 7
• Claude Code: v2.1.x (latest at time of report)