Most agent coding demos stop at a chat transcript. Witloop is an open plugin that runs a Spec-driven loop from idea to pull request on four hosts: Cursor, Claude Code, GitHub Copilot CLI, and Grok Build. Main steps are: brainstorm, research, plan, build, check, and ship. I'll show how /wit:dev routes feature vs bug-fix vs investigation, and how with one command you go from idea to full implementation, what lands in .wit/ on a project. Repo: https://github.com/Wittenberger-Industries/witloop