vgsp-sema: SESSION 138 GR request-builder page-list + fill-candidate witness (sema_dbg-gated, bounded)

The dstpend/n_data frontier needed the launch's actual wiring. Prints, once
per launch within a bounded budget: the candidate handle, param_va, prog_va,
n_pointer + the QMD pointer pairs, the inline-rec count, and the resolved
gr_pages list (va/pa/ap/qmd_word); then in the fill, the built candidate
set with the arg flag.

First capture (r788, Vulkan launch h=0xbeec0100): param=0x4b86000 ->
page pa=0x386000 ap=2 qmd_word=32; prog=0xdff0feb900 -> page
pa=0x56b000 ap=2 qmd_word=48; ptr[0]=0xdff0febc00 word=34 (DEDUPED into
the qmd_word=48 page - same 4K page - and that page is never scanned by
the fill's word-32/32..47-even passes); the fill's only candidate is
0x43f00000 (arg=1, from the inline bytes) which resolves in NO vaspace
(rc=-2 in all four) -> n_data=0 -> the backend's min_data=2 refusal. The
param/prog/QMD-window pages read all-zero in the vidmem shadow on this
boot, so the launch's data/code bytes exist in no host-visible source.

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