vgsp: mode 34 - context-share golden execution lane (compile-verified, untested)

Mode 34 allocates FERMI_CONTEXT_SHARE_A (0x9067) on the ladder TSG before the
golden replay; the replay's golden channel A (0xcaf00054) attaches to the share
with hVASpace=0 and keeps the captured unwired shape, runs its 9-entry promote
and carries TURING_A (0xc597) plus a TURING_COMPUTE_A (0xc5c0, handle
0xcaf00090). V6 (0xcaf00034) attaches to the same share, constructs no class
object of its own, and its FWCLIENT promote is suppressed; stage 4 and the
forwarded launches run on V6 in A's shared VEID/subcontext. Default off; all
paths gated by gsp_phys_rmcall_gr_promote=34. New pr_info cycle landmarks for
the share alloc, A alloc/promote, A construct (rpc_result), V6 alloc and the
instance/RAMFC decode. No hardware run.

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