Can Coding Agents Program in M&Ms Language?

What happens when you challenge a coding agent with an esoteric programming language it has never seen (freshly invented, with very few examples), and where the source code is literally colored M&Ms on a table? No documentation beyond the opcode table. No Stack Overflow threads. No training examples to memorize. Just six candy colors, a stack machine, and a dare. I tried it with MNM Lang, a toy…