fix: scope golangci-lint cache per worktree, correct eks-node-gpu catalog description (#629)

* fix: scope golangci-lint cache per worktree

golangci-lint's default cache under ~/.cache/golangci-lint is keyed by
module path rather than worktree path, so parallel worktrees of this
module collide and surface each other's lint issues, including from
worktrees that have since been deleted.

* fix: correct eks-node-gpu catalog description to match agent-only image

The GPU node image never installs eks-token-webhook or a server/agent
role selector, per scripts/images/eks-node-gpu/manifest.conf; it ships
ecr-credential-provider only and is agent-only because GPU nodes never
run the EKS control plane.

.gitignore

@@ -37,3 +37,6 @@ Thumbs.db
 
 # Test reports
 *-report.txt
+
+# Per-worktree golangci-lint cache
+/.cache/

Makefile

@@ -1,6 +1,11 @@
 GO_PROJECT_NAME := spx
 SHELL := /bin/bash
 
+# golangci-lint's default cache (~/.cache/golangci-lint) is keyed by module
+# path, not worktree path, so parallel worktrees of this module collide and
+# surface each other's issues. Scope it per worktree.
+export GOLANGCI_LINT_CACHE := $(CURDIR)/.cache/golangci-lint
+
 # Detect architecture for cross-platform support
 ARCH := $(shell uname -m)
 ifeq ($(ARCH),x86_64)

spinifex/utils/images.go

@@ -440,7 +440,7 @@ var AvailableImages = map[string]Images{
 	// tags — CreateNodegroup selects it for GPU instance types instead of the Alpine AMI.
 	"spinifex-eks-node-gpu": {
 		Name:         "spinifex-eks-node-gpu",
-		Description:  "Mulga EKS GPU node image — Ubuntu 26.04 + NVIDIA driver + K3s v1.32.5 + eks-token-webhook (server|agent role selected at first boot)",
+		Description:  "Mulga EKS GPU node image — Ubuntu 26.04 + NVIDIA driver + K3s v1.32.5, agent-only (GPU nodes never run the EKS control plane, so no role selector or eks-token-webhook)",
 		Distro:       "ubuntu",
 		Version:      "26.04",
 		Arch:         "x86_64",