docs: document NVMe partition sizes and GPU output verification

Co-authored-by: aider (openrouter/openai/gpt-5.2) <aider@aider.chat>

niri-4screen.md

@@ -23,6 +23,14 @@ HARDWARE SUMMARY
 - Notes: There may be multiple /dev/dri/card* devices. Session must pick the
   correct device driving the 4 DP outputs.
 
+NOTE (2026-01 recon):
+- Current Ubuntu hardware scan shows NVIDIA Quadro P620 is driving /dev/fb0 at 1680x1050.
+- This suggests the monitors may actually be attached to the Quadro, not the Intel outputs.
+- Before finalizing GPU/device selection, verify:
+  - ls -l /dev/dri/by-path
+  - loginctl seat-status seat0
+  - (optional) niri output listing once in session
+
 KNOWN KERNEL / PLATFORM ISSUES
 - IOMMU faults / “Operation not permitted” style crashes were avoided on Ubuntu
   with kernel flags: