vgsp: end-to-end CUDA acceptance in the guest

The no-claim emulation path now runs a stock CUDA program end to end:
device properties, cudaMalloc, a GPU-authored string kernel read back
byte-for-byte, two 4 MB host-to-device copies, a 1 M-element vectorAdd
executed on the physical GPU through the host bridge, and the
device-to-host copy-back verified element by element. Three consecutive
supervised cycles report MAIL + VADD bad=0 checksum=392344090.500000 +
STATUS OK with identical input/output hashes.

Two data-path correctness fixes make the transfers sound:

- Once-only op execution per GPFIFO entry. The pump replays recently
  consumed ring entries when translation batches are injected so missed
  releases can land; re-executing a CE copy is not idempotent because
  its source is a client staging buffer that may have been refilled.
  Slots now record their raw entry words and a replayed entry matching
  that identity suppresses operations while still processing releases.

- Per-page translation of virtual operands. svc_copy resolved only the
  first page of a VA range and walked the PA linearly; client staging
  ranges are frequently split (observed 195 + 61 pages), so the tail of
  alternating chunks was read from unrelated memory. Multi-page copies
  now re-resolve each 4 KB page through the trusted resolver.

Also carries the earlier uncommitted emulation fixes that got the client
to the launch (QMD address-window gate, counter registration
persistence, 512 MiB emulated FB, bridge slot hygiene) and bounded
diagnostics (sema-bigop, sema-bigcopy, bridge-in/out hashes, daemon
INCHECK/OUTCHECK/dumps).

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