geany/geany ? reverse-engineered prompt

Build me a fast, lightweight desktop code editor and IDE for people who just want to open files and get work done without a lot of setup.

I want it to feel simple and quick, with syntax highlighting, code completion, call tips, folding, a symbol list, and support for common file types like C, Python, HTML, Java, PHP, and Perl. It should also have an embedded terminal and a plugin system so it can be extended later. Keep the interface clean and easy to use, and make it work well on Linux with a normal desktop, without depending on a huge environment.

Please set up the full app so it can be built from source and run locally, and include the usual project files, docs, and basic tests or checks where they make sense. If you need to, look up current docs online for the build and GTK details so the app is set up correctly.