vgsp r801: gsp_phys_gr_min_data=0 is an explicit bypass (the no-external-data launch class), not a clamp to 1

The Vulkan compute launch's single QMD pointer pair names its own QMD
window and its params are scalars (0.2/640/480), so n_data=0 is correct
for it; the bare n_data>=min threshold refused it as degenerate. The
bypass is safe now that gsp_phys_chunk_page_va answers NULL for an
unallocated chunk (r800) - before that guard the empty-set post-mortem
print dereferenced a garbage pointer (Oops at
gsp_phys_backend_guest_gr_submit+0x4394). Default stays 16; 0 is opt-in
for the egg-break test that forwards the launch to the real engine so
the copy-out can carry pixels back. Proper launch-internal predicate
next.

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