arbade/quietclash ? reverse-engineered prompt

Build me a tool called quietclash that helps catch merge problems from parallel coding agents.

I want to point it at a base branch and two or more agent branches, and have it tell me if they merge cleanly but still behave differently at runtime. It should run the relevant code in each branch, compare the results, and give me a clear report with a simple explanation and at least one input that reproduces the problem. If nothing looks wrong, it should stay quiet and just say the branches seem compatible.

Make it work as a normal command line tool, and also as a Claude Code slash command if that fits the repo. I’d like a few example commands, a demo script, and tests that cover both a real conflict and a clean merge. If you need to check current Node or Claude Code docs online, go ahead.