Claude Code v2.1.237 fixes prompt caching and adds Concise output style

Claude Code version 2.1.237 introduces a fix for prompt caching issues that occurred when using an LLM gateway or custom base URL.

• Fixed prompt caching for sessions using an LLM gateway or custom base URL.
• Added a built-in "Concise" output style that leads with results and skips preamble and narration while maintaining thoroughness, selectable under Output style in /config.