# Project memory

- RPN calculator JS project.
- Read `.memory/state.md` for current state.
- Keep names and commands in English.
- Update memory files based on events: engine, demo, API, commands, exports, docs, or tasks.
- Core arithmetic now includes `root` for y-th roots, and `samples/calc-02/` uses it for `y√x`.
- `samples/calc-02/` in portrait mode remains the active responsive demo.