r507o walk the CE channels before the GR channels: enforce the client's stream order in the pump itself

The streams order their H2D copies before the kernel that consumes them,
but the channels register in handle order (the RM's GR channel early, the
copy-CE channels later) and the pump walked them in that order; a pass that
decoded the GR launch before the CE channel's entries ran let the forward
workqueue execute the launch's copy-in against pre-copy data (r480-sep:
copy-in 115 ms before its stream's H2D soft copies; r481 proved no host
semaphore links the two). The CE copies execute on the same service
thread, so consuming the CE entries first fixes the inversion without any
cross-channel hold. Stable partition of the pass snapshot; relative order
within each class is preserved.

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