Revert "Drop careless-gpu: the [cuda] pip extra install covers GPU and CPU nodes"

This reverts commit 5f25c83085.

careless-gpu/build

@@ -0,0 +1,26 @@
+#!/usr/bin/env modbuild
+
+pbuild::prep() {
+    :
+}
+
+pbuild::configure() {
+    # same uv pattern as the careless (CPU) module; see that build for the whys
+    UV="${UV:-$HOME/.local/bin/uv}"
+    export UV_CACHE_DIR="${UV_CACHE_DIR:-$PREFIX/.uv-cache}"
+    export UV_PYTHON_INSTALL_DIR="$PREFIX/python"
+    "$UV" venv --python 3.12 "$PREFIX/venv"
+}
+
+pbuild::compile() {
+    :
+}
+
+pbuild::install() {
+    UV="${UV:-$HOME/.local/bin/uv}"
+    export UV_CACHE_DIR="${UV_CACHE_DIR:-$PREFIX/.uv-cache}"
+    # no [cuda] extra: CUDA comes from the cuda/12.8.1 module
+    # (build_requires/runtime_deps in files/config.yaml), not from pip wheels
+    "$UV" pip install --python "$PREFIX/venv/bin/python" "careless==${V_PKG}"
+    [[ "$UV_CACHE_DIR" == "$PREFIX"* ]] && rm -rf "$UV_CACHE_DIR" || :
+}