That's exactly what it is - formalizing and creating a standard induces efficiency. Along with things like AGENTS.md, it's all about standardization.

What bugs me: if we're optimizing for LLM efficiency, we should use structured schemas like JSON. I understand the thinking about Markdown being a happy medium between human/computer understanding but Markdown is non-deterministic for parsing. Highly structured data would be more reliable for programmatic consumption while still being readable.

In general, markdown refers to CommonMark and derivatives now. I’d be surprised if that wasn’t the case here.