[BUG] `claude --model=default` does not work.

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.100 (Claude Code)
• Operating System: macOS 14.4.1（23E224）
• Terminal: iTerm2

Bug Description

<!-- A clear and concise description of the bug -->

claude --model=default does not work.

Expected Behavior

<!-- What you expected to happen -->
It is recognized as a default alias specified in official document.

Actual Behavior

<!-- What actually happened -->

It is recognized as a custom model called 'default'.