T4 auto-runs shipped-mod suites ROM-free: the test now uses
T.fixtures.fresh() (FIXMON_A) with the level assertion derived from the
growth curve, and the now-covered event:save.loaded DEBT entry is
removed as gate_meta_coverage instructs. All four CI jobs reproduced
green on a ROM-free checkout.
Suite discovery, the extension-point catalog scan, mod test-dir pickup,
and the meta-coverage corpus all shelled out to ls/find/test -d, which do
not exist in cmd.exe. Every listing came back empty on Windows, so tiers
ran 0 suites and still reported ALL TESTS PASSED.
Add portable probes to tests/fs_io.lua (same Unix commands on
Linux/macOS; dir /b and a shell-free rename-self existence check on
Windows) and rewire the four call sites to them. 15/15 engine suites and
2/2 modkit suites now genuinely run and pass on Windows.
Fixes#266
Co-authored-by: johnjohto <johnjohto@users.noreply.github.com>