output: the abstraction artefacts live with the pod

pod/ holds all document source representations:
  pod/<doc>/                             source tree
  pod/<doc>/media/abstraction/<uid>.ssp  abstraction, as text
  pod/<doc>.zip                          tree, zipped, .ssp included
  pod/<doc>.digests.txt                  sha256s of what is in them
  pod/<uid>.ocda.db                      abstraction, as sqlite db

<lang>/abstraction/ is gone.
pod/<doc>/media/abstraction/<uid>.ssp preferred as having the
images (found within the pod tree) which .ssp needs to reproduce a
document but does not carry on its own.

The .ocda.db sits carries the images as well and (like the
pod.zip) can be used to reproduce a document directly.

digests.txt now covers the database as well as the zip, the source
and the .ssp; (as does the metadata html page).

Two ordering issues addressed:
- the pod builder clean-slates pod/<doc>/ before regenerating it,
  and the .ssp is now written before that runs. The clean slate
  now leaves media/abstraction/ alone, and the .ssp writer clears
  that directory itself on the first language of a run, so a .ssp
  for a language the document no longer is removed and cannot be
  bundled.
- for a multi-language document the .ssp files accumulate one
  language at a time and are bundled on the last, which is why the
  directory cannot simply be emptied by whichever (language) gets
  there first.

(assisted by Claude-Code)

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