esengine/deepseek-reasonix ? reverse-engineered prompt

Build me a terminal based AI coding assistant called Reasonix that feels like a real developer tool, not a chat toy.

It should let me set up a model once, start an interactive session, and also run one off commands like asking it to implement TODOs in a file. Keep it focused on DeepSeek first, but let me switch to other compatible providers from a simple config file. I want it to remember enough project context to stay useful over long sessions, and I want the startup context and tool output handling to be stable so token use stays low.

Make it work as a single Go binary, with a clean CLI and a nice terminal interface. Support plugins or external tools that can be called safely from the session, plus approvals before risky actions. If it helps, look up current docs online for anything unclear. I also want the setup to be simple, with a clear example config and a good first run experience.