sema-svc: run CE work before its release, grace unreadable CE entries, payload-pattern audit

- CE LAUNCH_DMA releases are now applied after the push's collected work
  runs: the client reads copied data as soon as it observes the release,
  so release-first let cuMemcpyDtoH observe a copy that had not executed.
- Unreadable CE entries stay pending for a grace window (sema_ce_grace_ms,
  default 8s) before the release fallback consumes them, so a translation
  that lands within a service pass lets the push be decoded and its work
  executed instead of being dropped.
- sema_copy_pat matches an 8-byte value against every copy's src/dst first
  word and scans decoded pushes for it, naming the submission that carries
  a known payload regardless of size/encoding.
- sema-dma-skip logs transfer-shaped launches that collect no op; op log
  lines carry the channel handle; LAUNCH_DMA inventory follows OPS_LOG.
- A real release application now records the release VA, so decoded pushes
  no longer trigger a spurious fake release.

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