Unblocks the rest of the migration. soh.o2r is produced by ZAPD via
OTRExporter/extract_assets.py, both of which this migration deletes; its
replacement is a small in-tree packer that has to reproduce ZAPD's
texture quantisation exactly. Rather than block Phases 2/3/5 on that
packer, check the archive in and make GenerateSohOtr a copy.
The archive doubles as Phase 4's acceptance oracle -- the packer is
correct when its output matches this entry-for-entry -- which is strictly
more useful than Gate E's planned manifest of hashes of it.
Generation turns out to be content-deterministic but NOT byte-
deterministic: two runs give identical payloads for all 1,042 entries but
different file hashes, because zip stores per-entry timestamps. So the
Phase 4 comparison must be entry-wise; whole-file would fail even on a
correct archive. Recorded in prebuilt/README.md.
Adds a configure-time guard on the baked-in portVersion. OTRGlobals.cpp
:283 requires exact major.minor.patch equality and RunExtract exit(1)s
with "soh.o2r is outdated", which is an opaque symptom for a stale
checked-in file; verified the guard fires by building against 9.2.4.
ExtractAssets, CI and copy-existing-otrs.cmake are deliberately untouched
-- ExtractAssets still generates a correct archive while ZAPD exists, and
the CI job keeps working since it just builds this target.
briaguya