Tabby v0.32 adds multi-branch context, Mistral RAG

Tabby is moving from a simple Copilot clone to a mature enterprise code intelligence platform by prioritizing scalability and modular RAG. Multi-branch indexing allows the AI to stay in sync with complex development workflows, while support for Mistral's embedding API enables higher-quality vector search without sacrificing privacy. Sharded indexing support for large deployments makes it a viable competitor for enterprise codebases, and the shift toward active agents like Pochi suggests a future in autonomous engineering tasks.