vgsp: GR golden-replay groundwork and FWCLIENT promote mode 24

- golden replay (gsp_phys_rmcall_golden, default off): replay the stock
  client's post-load golden channel allocations (separate VAS, pushbuffer
  objects, USERD, bare GR channel, TURING_A 3D object) before the ladder
  channel; best-effort: a failure warns and the ladder continues.
- on-ladder TURING_A (0xc597) 3D object allocation before the compute
  object (best-effort) to initialize server-side GR-instance state.
- promote mode 24: the reference FWCLIENT non-3D set (MAIN, PM, PATCH,
  FECS_EVENT, PRIV_ACCESS_MAP, UNRESTRICTED_PRIV_ACCESS_MAP) as one
  GPU_PROMOTE_CTX on the KMD channel, with per-entry logging and explicit
  omission semantics; mode clamps/descriptions extended to 24.

Live: mode 23 soft-stops 0x1f on the server-managed shared channel and
reaches the per-buffer commit on the KMD channel, where it stops at the
missing engine-context memdesc; mode 24 emits all six entries and is
refused with 0x1f before BIND. All cycles release clean, GPU green.

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