alternateScreen: false setting is ignored (v2.1.169)

Version: Claude Code 2.1.169

Problem:
Setting "alternateScreen": false in ~/.claude/settings.json is being ignored.
Claude Code continues to use alternate screen mode regardless of this setting.

Impact:

• tmux copy-mode cannot scroll back through Claude Code output
• tmux scrollback buffer does not retain Claude Code history
• Only the current screen content is accessible in tmux

Expected behavior:
When "alternateScreen": false is set, Claude Code should NOT use alternate
screen mode, allowing tmux to retain full scrollback history.

Settings file content:

{
  "alternateScreen": false,
  "env": { ... },
  "enabledPlugins": { ... },
  "prefersReducedMotion": true,
  "theme": "dark",
  "skipAutoPermissionPrompt": true
}

This is a critical UX issue for users who work in tmux and need to scroll
back through previous conversations.