suddenly cannot login/boot after "upgrade" of 10.13.3 -> 10.13.4 installer errors

Context: Newish 2017 Macbook Pro from December (~4 months old) was working fine. Recently I installed all the new software updates via the App Store, including, I thought, macOS 10.13.4.

I continued working for a day or two, then I shut down my computer to travel to a meeting.

When I tried to start my computer at the meeting, I saw the login screen, entered my password and waited as it suddenly took a much, much longer time than normal to load after login.

Eventually a strange green "topology map"-style pattern took over the whole screen for a split second, and finally it stopped trying to login and went to the black Apple logo screen with a new progress bar.

See this in my error video: Error 1 Video.

Eventually this black screen gives way to a quick, grey "Install macOS screen" with a new empty progress bar.

After a split second, the entire screen flashes to grey.

It then flashes a new grey modal that says:

"macOS could not be installed on your computer"
"An error occured while loading the Installer resources. Quit the Installer to restart your computer and try again."

See this happen in Error 2 Video.

I click restart and it takes me through the boot process again, but this time blows up and provides a log file and an error message that says:

The macOS installation couldn't be completed.

If you continue having a problem installing macOS, the installation log may help you diagnose the problem. To save the log click Save Log.

To start installing macOS again, click Restart.

To start up your computer using a different disk, choose Startup Disk from the Utilities menu.

See this screenshot for an example: Error 3 Screenshot.

The log is long and I'm unable to save it or export it from the computer, but it seems to have blown in somewhere in "Thread 0."

One thing I have tried, that did not work, was booting in "safe mode," going to the App Store, and redownloading and installing the 10.13.4 update. This produced the same pattern of errors and another crash log.

I have earliest available genius bar appointment in 4 days, but I'm a freelancer and this is my primary work computer, so it's creating an issue for me.

MacbookPro info:

• 13.3" MacBook Pro (Mid 2017, Silver) (no touch bar)
• 2.3 GHz Intel Core i5 Dual-Core
• 8gb RAM
• 256gb storage

Assets:

Error 1: Error 1 Video

Error 2: Error 2 Video

Error 3: Error 3 Screenshot

Folder: High Sierra Bug