vgsp-sema: SESSION 127 follow-up - gate the C5C0 translator behind sema_gr_xlate (default 0)

The r727 full battery with the translator active but ungated regressed three
clients (saxpy bad=1047527, math sums=0, multikernel hang) while r729 with
the translator's semantics gated off is clean on the same subset (mail,
saxpy, math OK; multikernel still stalls in its pre-existing flaky class).
All translator behaviour is now behind sema_gr_xlate (default 0 = exactly the
historical sweep):
- the tail-aware method parse (tail passed only when enabled),
- the sweep's inline-QMD accumulation, LOAD_INLINE_DATA materialization,
  C5B5 copy capture and candidate-owned release withholding,
- the client-VAS walk fallbacks in svc_gr_page_note / svc_gr_req_fill,
- the inline-rec filter at capture (keeps resolvable or QMD-named recs when
  enabled; historical keep-all when off),
- the pump's sweep-captured-launch request and copy fallback.

sema_gr_xlate=1 restores the full translator (r730 re-verified: launch
captured, page-notes, copy pend/done, submit refused n_data=0, release
authored, client completes). Flip the default once the two CUDA-side
hazards (stale-VAS resolution widening, rec-filter interaction) are
eliminated and the battery is proven clean with it on.

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