test: .ssp round trip script beside the other two

Reads each committed reference .ssp back into the abstraction, emits
it again, and requires byte identity. Both directions go through
template sspObjectRecord, the writer's own definition of a record, so
what is being checked is the reader against the writer and not against
a second description of the format.

  ./test/test-abstraction-ssp-roundtrip.sh ./bin/spine-ldc
  PASS: all 35 .ssp files read back and re-emit byte identically

It needs no sample documents and no output directory; the reference
set is the input. So the three tests now say three different things:

  test-abstraction-ssp.sh          the abstraction has not changed
  test-abstraction-db.sh           the two serialisations agree
  test-abstraction-ssp-roundtrip.sh  the .ssp can be read back whole

Added with -f, as test/ is covered by .gitignore's catch-all.

(assisted by Claude-Code)

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