Copies the working WildCat 4 conference set (7 conferences,
MAKEWILD.DAT, CONFDESC.*, MSG/MSG0..MSG6.DAT/IX, DATA/ALLUSERS.*,
etc., 228KB total) into the repo so the Wildcat backend test runs
without an external path dependency. Mirrors how the other format
tests carry their own sample data.
test_wildcat.pas SRC constant updated to point at tests/data/wildcat
instead of ~/allfix_dev/...; the test still copies to /tmp/ma_wildcat
before running so the vendored fixture stays untouched.