For what it's worth: AppleCare recovery of the iCloud files they deleted failed.
Bottom line: I was told that iOS does not store iWork files in the same format or manner as OSX and this makes recovering them difficult if not impossible. On top of this, once files are tagged by iOS as being iCloud files they DO NOT GET BACKED UP when your iPad is backed up to your Mac (or by association, to Time Machine either).
The final thing I discovered -- entirely on my own --- was that of the "skeleton" or ghost Pages files that survived, there were index.db files for each document. Their sizes closely matched those of my original intact files. (I thought they would be enough for Apple to reconstruct the full documents from but they said they were "useless.")
They were wrong.
The Index.db files don't open with any application and dragging and dropping to text editor did not work. But ...when I manually opened them in text editor they render scraps of actual readable text! I found in them my work scattered, broken, mixed up, repeated many times over, and containing older as well the most recent sections, but there were whole sentences and paragraphs among the mass of coding and near endless strings random characters. If the content of the whole file is copied and opened in Pages it ends up being ten times the length of the original and impossible to edit. But carefully copying selected sections renders useable text.
So, I at least have enough to reconstruct and rebuild the dozen or so most important short files that I desperately need. It will be a pain and a lot of work but it beats losing it all completely.
Why no one at Apple, including their iWork experts and engineers, suggested this or explored this or knew to look into this --- despite being made fully aware of my having index.db files --- I have no clue.
**If anyone out there knows some means of opening an iWork Pages index.db file in a manner that makes it more readable or useable, please let me know.**
Meanwhile, be warned: ICloud essentially holds all your iWork documents "hostage." They must be recognized by the cloud every time you access them even if you are not "working online." They really exist only as long as iCloud permits -- in other words, nothing corrupts their identification within iCloud. Otherwise, they can be deleted en masse from all your devices in a microsecond without any warning or permission just as has happened to hundreds of users now.
Having to now manually back up all your documents as a precaution defeats the entire point of storing "safely" in the cloud. Pathetic.
Use iCloud at your own peril.
JC