Bug: Cmd+V paste doesn't work in iTerm2

### Describe the bug

Paste via Cmd+V does not work in Copilot CLI when running in iTerm2 on macOS. The only way to paste is via the menu bar (Edit → Paste).

For comparison, Claude Code CLI handles paste correctly in the same terminal with identical settings.

Tried without success:

• /terminal-setup command
• Cmd+Shift+V
• iTerm bracketed paste mode enabled

Environment:

• macOS, iTerm2
• Copilot CLI v1.0.75

Expected: Cmd+V should paste text into the input
Actual: Nothing happens

### Affected version

GitHub Copilot CLI 1.0.75.

### Steps to reproduce the behavior

_No response_

### Expected behavior

_No response_

### Additional context

_No response_

Reproduce the issue with Copilot CLI v1.0.75 on macOS in iTerm2, checking Cmd+V and the attempted terminal setup options described in the report. Compare the behavior with menu-bar paste and confirm the work is done when Cmd+V pastes text into the CLI input.

Written by the indexing model from the issue text.