vgsp-gr r564: refuse a degenerate launch data set before the engine sees it

r565 evidence: the fill dropped 4 argument bases (GRFILL-DROP), RDW showed
nrecs=2 where healthy launches run 968-969, the launch was still submitted
and the backend timed out after ~19 s (GR forward failed rc=-110); the
tail then authored the software release and the client kept spinning on a
completion for a kernel that never ran - 20 s of backend occupancy plus a
false completion, and a plausible wedge source for the following clients.

gsp_phys_gr_submit now refuses n_data < GSP_PHYS_GR_MIN_DATA_RECS (16)
with a loud line, failing fast into the same software-completion fallback
without touching the engine.

0 files changed, 0 insertions, 0 deletions