An anonymous reader gave me a copy of the document that Sarah Bax (and others) have been looking for.
The one which Jason Kamras et al in DCPS Central Administration has been saying was so wonderful, but wasn’t available.
It was actually published by Mathematica, Inc. in the Spring of 2010.
It’s pretty long, and it’s in PDF format. I saved it here as a Google document so that anybody can attempt to read it and make sense of it:
I will warn you, it’s extremely heavy going, and it probably won’t help you understand VAM in DC any more (or less) than you already do (or don’t)!