I've edited https://wiki.debian.org/LightDM and written
https://wiki.debian.org/Xsession from scratch.  I hope this helps other
people who were as lost and confused as I was.

If you're still wondering what kind of documentation I was looking for,
you may use https://wiki.debian.org/Xsession as the answer.  That's
what I wanted to see.  I will be able to point users to this page in
the future.

Thanks to all who provided information.

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