Kimi CLI 1.39.0 Update: New Features and Fixes

Kimi CLI 1.39.0 introduces new features, including the `KIMI_MODEL_THINKING_KEEP` environment variable for preserved thinking and `inject_yolo_prompt` to control yolo mode prompt injection. The update also delivers several bug fixes, addressing issues with JSON Schema for MCP tool parameters, empty assistant tool-call messages, and the `openai_legacy` reasoning_key for DeepSeek 400.