Supposedly, this console command will add my private SSH key to the Apple keychain, as explained in This answer in the question, How to use Mac OS X Keychain with SSH keys?:
ssh-add -K path-to-my-private-key-to-SSH
If that is successful …
➥ What is the type and name of the entry found in the Keychain Access.app?
I would like to be able to verify manually and possibly delete that entry.