[BUG] v2.1.94 breaks Bedrock Bearer Token auth - "Authorization header is missing"

Environment

• Claude Code version: 2.1.94 (regression from 2.1.92)
• Platform: macOS (Darwin 25.4.0, arm64)
• Auth method: AWS_BEARER_TOKEN_BEDROCK environment variable
• Model: global.anthropic.claude-opus-4-6-v1
• Region: us-east-1

Bug Description

After upgrading from v2.1.92 to v2.1.94, all Bedrock API calls fail with:

API Error: 403 {"Message":"Authorization header is missing"}

v2.1.92 works fine with the exact same environment variables and configuration.

Steps to Reproduce

1. Set environment variables:

``bash
export CLAUDE_CODE_USE_BEDROCK=1
export AWS_BEARER_TOKEN_BEDROCK=<your_token>
export AWS_REGION=us-east-1
export ANTHROPIC_MODEL=global.anthropic.claude-opus-4-6-v1
``

1. Run v2.1.94:

``bash
/path/to/2.1.94 -p "say hello"
``

1. Observe 403 error: Authorization header is missing

Expected Behavior

The Bearer Token from AWS_BEARER_TOKEN_BEDROCK should be sent as the Authorization header in Bedrock API requests, as it works in v2.1.92.

Actual Behavior

v2.1.94 does not include the Authorization header in the request, causing a 403 rejection from Bedrock.

Workaround

Roll back to v2.1.92.