LLM 0.32rc2 released with content-addressable logs and new default model

LLM 0.32rc2 follows RC1, fixing dependency issues and adding two features: the default model is now GPT-5.6 Luna (was GPT-4o mini), and content-addressable logs capture detailed prompt/response data. Also released concurrently: llm-chat-completions-server 0.1a0 for OpenAI-style chat endpoints.