sema-svc: bounded diagnostics for GR counter writes; scanner guarantees counter-page delta

- rel-apply/publish now log the first 32/48 outcomes (written, skipped with
  current value, no slot, read failure) so the live counter page can be
  matched against host writes.
- guest pin scanner logs the counter page's pagemap state each loop and adds
  it to the delta set explicitly, so the page is pinned the moment it is
  mapped even if the window scan misses it.

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