feat(gpu): disable NFD/GFD and remove nodeAffinity from device plugin chart

Disables GPU Feature Discovery and Node Feature Discovery DaemonSets and
overrides the device plugin's default nodeAffinity to null so it schedules
unconditionally on the single-node gateway without requiring NFD/GFD labels.

Setting affinity to an empty map ({}) does not override the chart defaults
because Helm deep-merges user values with chart defaults. Using null explicitly
removes the key, causing the chart template to skip the affinity block entirely.

Author: elezar

.agents/skills/debug-openshell-cluster/SKILL.md

@@ -303,6 +303,7 @@ If DNS is broken, all image pulls from the distribution registry will fail, as w
 | mTLS secrets missing | Bootstrap couldn't apply secrets (namespace not ready) | Check deploy logs and verify `openshell` namespace exists (Step 6) |
 | mTLS mismatch after redeploy | PKI rotated but workload not restarted, or rollout failed | Check that all three TLS secrets exist and that the openshell pod restarted after cert rotation (Step 6) |
 | Helm install job failed | Chart values error or dependency issue | `openshell doctor exec -- kubectl -n kube-system logs -l job-name=helm-install-openshell` |
+| NFD/GFD DaemonSets present (`node-feature-discovery`, `gpu-feature-discovery`) | Cluster was deployed before NFD/GFD were disabled (pre-simplify-device-plugin change) | These are harmless but add overhead. Clean up: `openshell doctor exec -- kubectl delete daemonset -n nvidia-device-plugin -l app.kubernetes.io/name=node-feature-discovery` and similarly for GFD. The `nvidia.com/gpu.present` node label is no longer applied; device plugin scheduling no longer requires it. |
 | Architecture mismatch (remote) | Built on arm64, deploying to amd64 | Cross-build the image for the target architecture |
 | Port conflict | Another service on the configured gateway host port (default 8080) | Stop conflicting service or use `--port` on `openshell gateway start` to pick a different host port |
 | gRPC connect refused to `127.0.0.1:443` in CI | Docker daemon is remote (`DOCKER_HOST=tcp://...`) but metadata still points to loopback | Verify metadata endpoint host matches `DOCKER_HOST` and includes non-loopback host |

architecture/gateway-single-node.md

@@ -300,7 +300,7 @@ GPU support is part of the single-node gateway bootstrap path rather than a sepa
 - When enabled, the cluster container is created with Docker `DeviceRequests`, which is the API equivalent of `docker run --gpus all`.
 - `deploy/docker/Dockerfile.images` installs NVIDIA Container Toolkit packages in a dedicated Ubuntu stage and copies the runtime binaries, config, and `libnvidia-container` shared libraries into the final Ubuntu-based cluster image.
 - `deploy/docker/cluster-entrypoint.sh` checks `GPU_ENABLED=true` and copies GPU-only manifests from `/opt/openshell/gpu-manifests/` into k3s's manifests directory.
-- `deploy/kube/gpu-manifests/nvidia-device-plugin-helmchart.yaml` installs the NVIDIA device plugin chart, currently pinned to `0.18.2`, along with GPU Feature Discovery and Node Feature Discovery.
+- `deploy/kube/gpu-manifests/nvidia-device-plugin-helmchart.yaml` installs the NVIDIA device plugin chart, currently pinned to `0.18.2`. NFD and GFD are disabled; the device plugin's default `nodeAffinity` (which requires `feature.node.kubernetes.io/pci-10de.present=true` or `nvidia.com/gpu.present=true` from NFD/GFD) is overridden to empty so the DaemonSet schedules on the single-node cluster without requiring those labels.
 - k3s auto-detects `nvidia-container-runtime` on `PATH`, registers the `nvidia` containerd runtime, and creates the `nvidia` `RuntimeClass` automatically.
 - The OpenShell Helm chart grants the gateway service account cluster-scoped read access to `node.k8s.io/runtimeclasses` and core `nodes` so GPU sandbox admission can verify both the `nvidia` `RuntimeClass` and allocatable GPU capacity before creating a sandbox.
 

deploy/kube/gpu-manifests/nvidia-device-plugin-helmchart.yaml

@@ -7,8 +7,10 @@
 #
 # The chart installs:
 #   - NVIDIA device plugin DaemonSet (advertises nvidia.com/gpu resources)
-#   - GPU Feature Discovery (labels nodes with GPU properties)
-#   - Node Feature Discovery (dependency for GFD)
+#
+# NFD and GFD are disabled; the device plugin's default nodeAffinity
+# (which requires nvidia.com/gpu.present=true) is overridden to empty
+# so it schedules on any node without requiring NFD/GFD labels.
 #
 # k3s auto-detects nvidia-container-runtime on PATH and registers the "nvidia"
 # RuntimeClass automatically, so no manual RuntimeClass manifest is needed.
@@ -27,6 +29,7 @@ spec:
   valuesContent: |-
     runtimeClassName: nvidia
     gfd:
-      enabled: true
+      enabled: false
     nfd:
-      enabled: true
+      enabled: false
+    affinity: null