vgsp-sema r595: run a plausible GR push's ops - the driver's relocation copies live on a compute channel

The r568 b-copy class is rooted in the op gate: allow_ops was
(ch->engine_type != 0), so a GR-class channel's own memory copies
(LAUNCH_DMA on h=0x5c000059, eng=0) never executed unless the push page
came from an injected pin. Their releases were still applied by the
op-hold path, the client's blocking cudaMemcpy returned, and the launch
read the pre-copy page (c = a + 0).

Admit ops when the push content is a plausible method stream - the same
content arbiter (cap_trust) that already gates GR launch capture - never
on a replay or a rehold. Measured: the d_a/d_b relocation copies now run
~0.5-1.5 s after the driver submits them instead of tens of seconds.

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