Having run a Markdown memory system with Claude for over a year, I don't think I've seen any evidence of neuralese. That's even with Claude being regularly encouraged to write "reflections" on each session, including automated sessions, and weekly summaries of those reflections.

The bigger problem is avoiding what I call the Memento Effect. I won't spoil the movie for anyone, but Memento involves a character who cannot make new memories, so he has to take meticulous notes about everything. But if any of those notes are vague or incorrect, they still get accept as truth when next reviewed. So you really need your Markdown memory to be pristine and mustn't allow it to become polluted.