Phoenix PXI Development Phoenix has a built-in AI assistant named PXI (pronounced "pixie"). PXI is the user-facing name for the assistant feature — backend configuration (env vars, project names) uses generic / naming, not "PXI". Naming in code: don't write "PXI" in code comments, docstrings, or symbol/variable names. "PXI" is only the product/brand name for the assistant; in code prose refer to it as "the assistant". Reserve "PXI" for user-facing UI copy and docs. Keep identifiers on the generic / vocabulary already used throughout the codebase ( , , etc.). The model-facing surface (tool def…