[BUG] 1.0.98 auth broken when using AWS with a proxy.

Environment

• Platform (select one):
• [ ] Anthropic API
• [x] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.98
• Operating System: macOS (Darwin 24.6.0)
• Terminal: Ghostty

Bug Description

Claude Code v1.0.98 fails to authenticate with AWS Bedrock when using a proxy setup that works perfectly in v1.0.96. The application reports "Missing API key" error despite having ANTHROPIC_AUTH_TOKEN and other Bedrock environment variables properly configured. The /status command also reports "invalid settings" in v1.0.98, while the same configuration works flawlessly in v1.0.96.

Steps to Reproduce

1. Configure Bedrock authentication with proxy using environment variables:

• CLAUDE_CODE_USE_BEDROCK=1
• CLAUDE_CODE_SKIP_BEDROCK_AUTH=1
• ANTHROPIC_BEDROCK_BASE_URL=https://[redacted-proxy-url]/bedrock
• ANTHROPIC_AUTH_TOKEN=[redacted]
• ANTHROPIC_MODEL=us.anthropic.claude-sonnet-4-20250514-v1:0

1. Upgrade from Claude Code v1.0.96 to v1.0.98
2. Attempt to use Claude Code with claude command
3. Try running claude /status command

Expected Behavior

• Claude Code should authenticate successfully with Bedrock using the proxy configuration
• API calls should work as they did in v1.0.96
• /status command should show valid settings and authentication status

Actual Behavior

• Claude Code fails with "Missing API key" error when attempting to make API calls
• /status command reports "invalid settings"
• The exact same configuration and environment variables work perfectly when downgrading back to v1.0.96
• Authentication and API functionality is completely broken in v1.0.98

Additional Context

• This appears to be a regression bug specific to v1.0.98
• The issue affects Bedrock authentication with custom proxy configurations
• Workaround: Downgrading to v1.0.96 resolves all authentication issues
• Environment variables are identical between working (v1.0.96) and broken (v1.0.98) versions
• Configuration files (settings.json) are also identical between versions