wokwi/rp2040js ? reverse-engineered prompt

Build me a Raspberry Pi Pico emulator in TypeScript that I can run locally in the browser or with Node, something that behaves enough like a real RP2040 to boot simple firmware, blink LEDs, print UART output, and open a MicroPython or CircuitPython REPL.

I want to be able to load a UF2 or hex file, start the emulator with one command, and see the serial output in the terminal. If possible, add a GDB server on port 3333 so I can debug programs too. It should also support a simple filesystem image for MicroPython and CircuitPython so I can run multi file scripts, with a clear way to drop in a LittleFS or FAT image.

Please include a small demo project and a few examples I can run right away, like a blink sketch and a UART hello world. Make the setup easy to follow, and if you need to check current docs or firmware details online, go ahead and do that.