docs: record post-reboot environment and GPU verification

Deployment 45.20261105 booted (kernel 7.2.15-ogc1.1.fc45). Operator nvidia-smi
confirms the RTX 5070 Ti renders the Wayland session on driver 615.78.08;
vulkaninfo loads instance 1.4.350 but the physical-device line was not captured.
Tooling gaps after the update are listed as current state.

Docs/setup.md

@@ -10,10 +10,10 @@ Anything marked **human step** needs credentials, licence acceptance, or a decis
 
 ## 1. System
 
-- `[-]` Update Bazzite with its supported mechanism.
-  `ujust update` (or `rpm-ostree upgrade`), then reboot. Deployment `45.20261105` is already staged and needs a reboot to boot.
-- `[ ]` Verify the NVIDIA driver and Vulkan from the desktop session.
-  `nvidia-smi` must name the RTX 5070 Ti and driver `615.78.08`; `vulkaninfo --summary` must list a discrete NVIDIA GPU. These checks cannot be run from an agent shell — see [environment.md](environment.md).
+- `[x]` Update Bazzite with its supported mechanism.
+  `ujust update` (or `rpm-ostree upgrade`) followed by a reboot. Deployment `45.20261105` is booted and default; `44.20261026` retained as rollback.
+- `[-]` Verify the NVIDIA driver and Vulkan from the desktop session.
+  Driver done: `nvidia-smi` names the RTX 5070 Ti, driver `615.78.08`, and the Wayland desktop renders through it. Vulkan instance `1.4.350` loads, but the physical-device line was not captured — run `vulkaninfo --summary | sed -n '/GPU0/,/^$/p'` and record it in [environment.md](environment.md).
 - `[ ]` Install `git-lfs`, `cmake`, `ninja-build`, `clang` as an ostree layer, reboot, then `git lfs install`.
 
 ## 2. Engine acquisition