vgsp-gr r612: refuse the defer cap only for a DEGENERATE argument fill - stalled decoy candidates must not kill a launch whose real operands resolved

r586's fail-closed refused any launch still carrying unresolved argument
pages at the 15 s cap. streams2 as the first client of a fresh boot (r611)
shows the cost: its two launches carry candidates 0x783299000000 and
0x783297000000 that stall in EVERY source from the first fill (no pin, no
walk, no ledger; 'stalled VA' listed, never resolving in the run) while 969
real pages resolve, the r543 arg-defer is pre-empted by the CE watermark
defers, and at the cap both kernels are refused - STREAMS bad=65534 with the
engine never running.

Refuse only a degenerate fill (resolved < dropped - the r584 matmul shape, 2
resolved / 18 dropped, where the engine has no usable window). A
non-degenerate fill at the cap forwards historically and loudly
(fwd_gr_argfw witness): waiting longer cannot resolve a candidate stalled in
every source, and by this point every copy-related guard (dstpend, CE
watermark) has already had its chance and returned above when it fired.

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