Missing files on -current

A Pi4 running -current completed a build/install cycle for world and kernel
without obvious errors but failed to reboot, reporting:
....
Warning: no time-of-day clock registered, system time will not be set accurately
Dual Console: Serial Primary, Video Secondary
/etc/rc: run_rc_scripts: not found
/etc/rc: run_rc_scripts: not found
/etc/rc: have: not found

Sat Feb 24 13:42:09 UTC 2024
2024-02-24T13:42:10.007616+00:00 - init 31 - - can't exec getty '/usr/libexec/getty' for port /dev/ttyv1: No such file or directory 
....

Uname -a reports:
FreeBSD  15.0-CURRENT FreeBSD 15.0-CURRENT #121 main-n268499-b9870ba93ea9: Fri Feb 23 23:14:59 PST 2024     bob@nemesis.zefox.com:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC arm64distribution.

Power cycling allowed boot to single-user, running fsck -fy reports a clean
root file system.

/etc/fstab contains
/dev/da0s2a   /       ufs     rw      1       1
/dev/da0s1 /boot/msdos msdosfs rw,noatime 0 0
#tmpfs /tmp tmpfs rw,mode=1777,size=50m 0 0
/dev/da0s2d /usr        ufs     rw      2       2
/dev/da0s2b     none    swap    sw

There does not seem to be a file named run_rc_scripts present
in the filesystem.

Any suggestions on how to back myself out of this corner
would be much appreciated!

Thanks for reading,

bob prohaska