sema-svc: apply releases promptly and decode compute-push releases

The content sweep now:
- decodes a release whose method stream continues with any INC_METHOD,
  not only the CE LAUNCH_DMA group, so the releases at the head of a
  compute/GR channel's first push are applied too;
- remembers releases whose target VA had no translation (deferred list)
  and retries them every service pass, so a VA->PA injection lands them
  immediately instead of after the next full sweep;
- re-arms the fast sliced sweep for a few seconds after an injection;
- treats a channel whose USERD/ring cannot be resolved as stalled, so the
  sweep keeps looking for the releases its unreadable pushes carry.

tools: add per-cdt client-pin helper (sem pages + /dev/nvidia0 windows),
sem-page scanner and memprobe fixes (short-read guard, --brief).
Live-verified: injecting a client sem page applied 12 deferred releases
within a second; the service kept applying (89 -> 202) while cdt ran.

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