Bedrock custom-endpoint checks now go through a helper instead of ANTHROPIC_BEDROCK_BASE_URL alone

What

ANTHROPIC_BEDROCK_BASE_URL is the environment variable that points Claude Code at a custom Amazon Bedrock endpoint, such as an LLM gateway. Two places that used to read it directly now call a helper function instead:

• The check that decides whether Bedrock is using its default endpoint. Before, it tested whether ANTHROPIC_BEDROCK_BASE_URL was unset. The Vertex, Mantle and Google Cloud cases still check their own environment variables.
• The check for eager input streaming on Bedrock (sending a tool's input as it is produced, controlled by eagerInputStreaming.bedrock). Before, it also required ANTHROPIC_BEDROCK_BASE_URL to be unset. The Vertex branch still checks ANTHROPIC_VERTEX_BASE_URL.

Why

The members do not show what the helper looks at, so whether a custom Bedrock URL is still treated the same way depends on it. If you reach Bedrock through a gateway or custom endpoint, watch for differences in default-endpoint behaviour and in tool-input streaming.