llm 0.37

LLM 0.37 adds gpt-6.1-sol and gpt-6.1-terra, a new `llm openai endpoint add` command for configuring OpenAI-compatible endpoints, and switches the default model to gpt-6-luna at half the price of the previous default, gpt-5.6-luna. Embeddings support now allows different binary content to have different content-types, needed for models like Gemini Embedding 2 that can embed text, audio, images, and video. The release includes fixes from 12 authors, almost all AI-assisted, which the author says he treats as bug reports with attached examples and found less burdensome to review than expected.