v2.3-test515 — Map-card tutorial fix (Windows/Linux)

ReKHCoM v2.3-test515

Targeted Windows/Linux test for the disappearing Sora and door during the
map-card tutorial. Contains the integrated v2.3 work through PR519. This is
not stable2.3; the world-card glow report517, audio work and remaining review
are still pending.

1. Extract into a new folder and use your own ROM. Keep your working game
   and original saves.
2. Windows: open ReKHCoM.exe. Linux: open ReKHCoM Launcher.sh, or use
   ReKHCoM.sh with your existing native setup.
3. Try the tutorial after choosing Moment's Reprieve. Sora and the door should
   remain visible during the messages. Check normal/HD graphics if possible.

If copying progress, use a copy of the normal .sav save. Quick snapshots
from a different game build are not compatible. No new HD-media import is
required to test the actors; keep any owned HD imports separate from this ZIP.

Please report your platform and the test version, whether both actors remain,
and attach this test folder's log if it still fails. Local checks cover the
real Windows32/64 tutorial plus independent shared-renderer regressions.
Linux package verification is recorded separately; physical device results
must not be inferred from the Windows checks.