Release 1.0.18

[granawkins]

• Update Spice to v0.2
• Show a warning when not in a git repo
• Change default embeddings model to text-embeddings-3-large (or large?)
• Fix hardcoded warning about OpenAI api key in llm_api_handler
• If there's any issue with the embeddings model or provider, use the default (in-memory) database instead of chroma. This is probably on the ragdaemon side but need to test all the different cases for mentat: missing key, invalid key, broken provider...
• Fix context display (when auto-context, filetree is not accurate)