Send emails / txts notifications from gcode.

Very nice, thank you.
I have seen something similar quite a while back for LinuxCNC, but i could never find a use for it, besides sending camera pictures in intervals as progress notifications. This i use on 3D printers as i can stop or pause them remotely if something goes wrong. Uses Telegram bot, though.
Doing something similar using Signal (open source) would be nice.

Write up looks nice!

I swore I saw something in their files before, so I did some digging.  They have two files in the V2.x.x/python folder that may be of interest to you:
sms.py
sms_test.py

Looks like they used/experimented with twilio in the past to send messages.  It might be an easy integration to skip gmail entirely, and in the words of Andy Dusfresne (Shawshenk Redemption) "if you've come this far, maybe you're wiling to come a little further".

One tip - geany exists on PathPilot machines.  If you use it over gedit, you can switch line ending types without having to install anything extra.  Document -> Set Line Endings -> you can choose LF (Unix).  It's more geared toward coding so can make viewing a smidge easier.

I look forward to your future write ups.