️A Christmas Puzzle

With Advent of Code running a little shorter this year, I put together a quick puzzle with which I challenged the folks at work.

With the exception of one person who, over the course of several days and numerous guesses, managed to coax an LLM into giving them the right answer, it is as yet unsolved.

So here it is: there’s a message hidden in this file—what is it?

a-christmas-carol.b64