The current SPX documentation in Copilot knowledge base is missing some important information and needs to be supplemented: ### Physics Engine Related - [ ] What are the capabilities of SPX physics? - [ ] What is the relationship between non-API call physics behaviors (such as collisions) and project physics? - [ ] Explanation of sprite physics mode values and behaviors. ### Other Mechanisms - [ ] The documentation for other mechanisms such as Animation may also be incomplete and requires systematic review. Related PR: goplus/builder-backend#126