Within the framing that it's all fundamentally a make-document-longer algorithm, I propose "seed document."

While there's some metaphor to it, it's the kind behind "seed crystals" for ice and minerals, referring to non-living and mostly-mathematical process.

If someone went around talking about how the importance of "Soul Crystals" or "Ego Crystals", they would quite rightly attract a lot of very odd looks, at least here on Earth and not in a Final Fantasy game.

I quite like seed but for a different reason - if you squint a bit, it looks like a natural evolution of a random number seed.

My complaint against seed would be that it still harkens back to a biological process that could be easily and creatively conflated when it's convenient.