This is a diff of my WIP OpenSSH 8.6p1 update tree against the current OpenSSH 7.9p1 in freebsd/main. Posted here for testing and overall comment; not intended for review. (Although it may be useful to examine changes in specific files.)
D28624 is a roll-up review of FreeBSD's base system changes applied against upstream OpenSSH 8.6p1 and is more useful for review.