Can one create an iTerm / Terminal (MacOSX) Secure session?
Ahhh, it seems that Terminal (MacOSX Default app) doesn't save such data anywhere (at least under ~/Library/Application\ Support/)?  So my answer is how to have secure sessions (generally).  But it doesn't answer if iTerm2 does this anywhere else nor how to create 'secure sessions' (one where the commands aren't saved) using it.

This is my answer though I welcome anything better.