feat: NVIDIA fix only for RTX 20 series or newer, with the VRAM booster's chwd legacy check (vram_nvidia_legacy_id)

NVIDIA-RESEARCH.md

@@ -17,7 +17,9 @@ may be the gamescope/driver combination. `tests/nvidia-hardware-test.sh` collect
 - No source found that mentions these parameters for gamescope; the fix is a standard NVIDIA/Wayland setup, applied
   automatically. Whether it cures the 5080's picture is only known after `tests/nvidia-hardware-test.sh`.
 
-## Which cards (the user hopes older than RTX 2000 work)
+## Which cards (decision 2026-10-01: RTX 20 series or newer only, same check as the VRAM booster)
+The code skips a card whose PCI id is on chwd's legacy lists (`vram_nvidia_legacy_id`); the notes below are why older
+cards are not promised.
 - Open kernel modules: Turing (RTX 20, GTX 16) and newer only; they need the GSP processor first built into Turing.
   Maxwell, Pascal and Volta (GTX 900/10 series, Titan V) only work with the proprietary driver, whose legacy branch
   is 580. Source: [NVIDIA README, open kernel modules](https://download.nvidia.com/XFree86/Linux-x86_64/560.35.03/README/kernel_open.html),