It was from a famous quote supposedly from bill gates in the early days of computing: "640K (RAM) ought to be enough for anybody".

Apparently it was taken out of context or misattributed or something. Similar to "Al Gore said he invented the internet"

Heck, agents don't start editing before they're already at 70k for me.

I've played with explorer agents giving exploration summaries to help the implementer agents use more of their context for implementation, but it doesn't work as well. There's always something lost in the handoff.