vgsp: GLX shared-surface refCount fan-out + persistent direct-GL ring scan

V14: when the decoded GLX kickoff release targets the shared-surface
gpuRefCount word, write the forward-only value through every published
VAS translation and, when a candidate page carries a plausible
lastKickoffRefCount at +0x880, author that value instead. The X DDX
idle-channel wait compares those two words; a stale single-target write
left it polling until its 5 s warning. Gated by sema_gl_shsurf_allvas
(default on) with a bounded sema_gl_shsurf_dbg candidate log.

V15: refresh the beef GR ring content-scan slice budget while the ring
is unresolved and no submission has been observed, so a direct-GL client
that registers an empty ring before its first kick is still found when
it submits. Gated by sema_gr_ram_keep (default on). Adds a bounded
per-second scan witness (cursor/passes/hit) and a read-failure witness.

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