VS Code extension: Ctrl+A and Ctrl+E Emacs keybindings not working in terminal mode on macOS

Bug Description

When using the Claude Code VS Code extension with "Use Terminal" setting enabled, the standard macOS/Emacs keybindings Ctrl+A (move to beginning of line) and Ctrl+E (move to end of line) do not work. These are essential keybindings for terminal navigation on macOS.

Other Emacs keybindings such as Ctrl+F (forward character) and Ctrl+B (backward character) work correctly.

Note: When running claude directly in VS Code's integrated terminal (without the extension's "Use Terminal" mode), Ctrl+A and Ctrl+E work correctly. This issue only occurs when using the VS Code extension with "Use Terminal" enabled.

Steps to Reproduce

1. Install Claude Code VS Code extension
2. In VS Code Settings, enable "Claude Code: Use Terminal" (Launch Claude in the terminal instead of the native UI)
3. Launch Claude Code via the extension
4. Type some text
5. Press Ctrl+A to move cursor to the beginning of the line → does not work
6. Press Ctrl+E to move cursor to the end of the line → does not work
7. Press Ctrl+F to move cursor forward → works correctly
8. Press Ctrl+B to move cursor backward → works correctly

Works correctly:

• Running claude command directly in VS Code's integrated terminal → all Emacs keybindings work

Does not work:

• Launching Claude Code via VS Code extension with "Use Terminal" enabled → Ctrl+A and Ctrl+E are intercepted

Expected Behavior

All standard Emacs keybindings should work in the extension's terminal mode:

• Ctrl+A → move to beginning of line
• Ctrl+E → move to end of line
• Ctrl+F → move forward one character
• Ctrl+B → move backward one character

Actual Behavior

• Ctrl+A → intercepted by the extension (likely mapped to "Select All" or another action)
• Ctrl+E → intercepted by the extension (likely mapped to an extension command)
• Ctrl+F → works correctly (move forward)
• Ctrl+B → works correctly (move backward)

Environment

• OS: macOS (Darwin 25.2.0)
• VS Code: Latest stable
• Claude Code extension: Latest

Additional Context

On macOS, Emacs keybindings (Ctrl+A, Ctrl+E, Ctrl+F, Ctrl+B, Ctrl+K, Ctrl+D, etc.) are a fundamental part of terminal navigation. The extension should not intercept these keybindings when the terminal is focused, or should provide a passthrough option for terminal mode.

Since running claude directly in VS Code's terminal works without issues, the problem is clearly with the extension's keybinding interception when the "Use Terminal" setting is enabled.