doomemacs/core ? reverse-engineered prompt

Build me a Doom Emacs style configuration framework for GNU Emacs, something fast, modular, and easy to extend. I want it to feel like a polished editor setup for people who live in Emacs, with sane defaults, optional vim style editing, leader key shortcuts, better popup handling, and good package management that can install and pin packages from different sources. It should include a command line tool for installing, syncing, upgrading, and checking the setup, plus a doctor command that explains what is missing or broken.

Make it support a modular config layout so users can turn features on and off, and include sensible support for common programming languages, search, snippets, LSP, projects, and workspaces. Keep it close to stock Emacs where possible, but make startup and everyday use feel faster and cleaner. If you need to, look up current docs online and iterate until it feels solid.