Document the underlying algorithm

Is there a document that specifies the algorithm behind LifeHash?

I know there are at least three reference implementations in various languages, listed below for completeness, however it requires a lot of effort to reverse engineer these:
* Swift -- ;
* C++ -- ;
* Python -- (probably the best source for reverse engineering as it's [one self-contained source file](https://github.com/BlockchainCommons/bc-lifehash-python/blob/master/lifehash/lifehash.py));

For example I was looking for a pure Rust based implementation but there is none. I might have tried to implement one in a weekend, but there is no specification to start from, and reverse engineering an already implementation is far from a weekend project. :)

Also, for completeness, the video linked in the repository does give some insight, but it doesn't contain all the actual details:

lifehash/lifehash.py にある自己完結型の Python リファレンスから始め、その後、issue にリンクされている Swift および C++ の実装と比較してください。ビデオにない詳細も含めてアルゴリズム全体を文書化し、別の開発者が既存のライブラリをリバースエンジニアリングせずに LifeHash を実装できるようにしてください。

索引モデルが issue の本文から書いたものです。