It's likely not helpful to you, but it is to Claude. Basically a memory entry at the exact point of relevance, with the same caveats. One advantage though is it survives cloning, so another using the project benefits.
Problem is today's LLMs don't have the long term memory that humans have, and so remembering the reason behind a given change/decision has to be preserved in some way if it's non-obvious. Hence why there is {AGENTS|CLAUDE}.md, the auto-memory system, and 1001 variants of memory implementations in the wild. All are trying to ensure that LLMs can have the context they need at the location and time they need it. And you want to block Claude from using a technique that it natively finds helpful.