dotbot.conf.yaml: add shell-nvidia step (nouveau -> nvidia driver)

Install the proprietary/open NVIDIA driver from RPM Fusion on machines
with an NVIDIA GPU, replacing nouveau. The step is gated on NVIDIA GPU
presence (no-op otherwise), is idempotent, and does not auto-reboot.

akmod-nvidia already ships the prebuilt open module on Turing+/Ada, and
xorg-x11-drv-nvidia-cuda provides nvidia-smi + CUDA.

Document the step in CLAUDE.md and docs/fresh_install.md.

Author: ajay

CLAUDE.md

@@ -35,6 +35,7 @@ Only `make install` and `make git-submodule-update` auto-update submodules (and
 - `shell-build-tools-deps` — `make -C tools/build-tools deps-install`
 - `shell-dnf-update` — `dnf update` (Meta-aware: uses `up-no-meta` on Meta machines)
 - `shell-dnf` — install Fedora packages
+- `shell-nvidia` — install the NVIDIA driver (akmod-nvidia + CUDA) on machines with an NVIDIA GPU; no-op otherwise
 - `shell-insync` — install Insync (Google Drive sync)
 - `shell-pip` — install Python packages from `scripts/requirements.txt`
 - `shell-gnome-extensions` — install GNOME extensions (V-Shell, Tactile, Caffeine, Vitals)

docs/fresh_install.md

@@ -26,6 +26,14 @@
         ```
     - Log out and back in (picks up fish shell, GNOME extensions, dock layout)
 
+- NVIDIA (machines with an Nvidia GPU)
+    - Installed by `make install` (`shell-nvidia`: `akmod-nvidia` + `xorg-x11-drv-nvidia-cuda`); does not auto-reboot
+    - Reboot to finish the nouveau -> nvidia switch, then verify:
+        ```
+        nvidia-smi
+        lspci -nnk -d 10de:: | grep 'driver in use'   # -> nvidia
+        ```
+
 - Insync
     - Setup ajaysriv@meta.com sync to ~/mdrive
     - Setup ajaysriv3@gmail.com sync to ~/gdrive

dotbot.conf.yaml

@@ -86,6 +86,12 @@
       - - sudo -v && yes | sudo remove-retired-packages
         - "=> shell-dnf: remove-retired-packages"
 
+- shell-nvidia:
+  - if: 'lspci -d 10de:: -nn | grep -Eiq "VGA compatible|3D controller"'
+    shell:
+      - - sudo -v && sudo dnf -y config-manager setopt rpmfusion-nonfree-nvidia-driver.enabled=1 && sudo dnf -y install akmod-nvidia xorg-x11-drv-nvidia-cuda
+        - "=> shell-nvidia: install NVIDIA driver (reboot afterwards)"
+
 - shell-insync:
   - shell:
       - - sudo -v && sudo rpm --import https://d2t3ff60b2tol4.cloudfront.net/repomd.xml.key