ci: add versioned Cloud Agent dev environment (.cursor)

.Rbuildignore

@@ -5,6 +5,8 @@
 ^\.Rprofile$
 ^\.github$
 ^\.github/.*
+^\.cursor$
+^\.cursor/.*
 ^\.codegraph$
 ^\.codegraph/.*
 ^.*\.Rcheck$

.cursor/environment.json

@@ -0,0 +1,4 @@
+{
+  "name": "aFIPC",
+  "install": "bash .cursor/install.sh"
+}

.cursor/install.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Cloud Agent install step for the aFIPC R package.
+#
+# The R toolchain and CRAN dependencies (mirt, testthat, rcmdcheck, roxygen2)
+# are normally already present in the prebuilt environment base image/snapshot.
+# The guarded block below only runs on a bare image so this script stays
+# idempotent and self-contained. R itself is pulled from the CRAN "release"
+# channel (matching the r.yml CI), and CRAN packages come from r2u as prebuilt
+# Ubuntu binaries so mirt does not have to be compiled from source.
+set -euo pipefail
+
+if ! command -v R >/dev/null 2>&1; then
+  sudo apt-get update -qq
+  sudo apt-get install -y --no-install-recommends wget ca-certificates gnupg dirmngr
+
+  # CRAN apt repo: release R for Ubuntu noble.
+  wget -q -O- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc \
+    | sudo tee /etc/apt/trusted.gpg.d/cran_ubuntu_key.asc >/dev/null
+  echo "deb [arch=amd64] https://cloud.r-project.org/bin/linux/ubuntu noble-cran40/" \
+    | sudo tee /etc/apt/sources.list.d/cran_r.list
+
+  # r2u: prebuilt binary CRAN packages for Ubuntu noble.
+  wget -q -O- https://eddelbuettel.github.io/r2u/assets/dirk_eddelbuettel_key.asc \
+    | sudo tee /etc/apt/trusted.gpg.d/cranapt_key.asc >/dev/null
+  echo "deb [arch=amd64] https://r2u.stat.illinois.edu/ubuntu noble main" \
+    | sudo tee /etc/apt/sources.list.d/cranapt.list
+  printf 'Package: *\nPin: release o=CRAN-Apt Project\nPin: release l=CRAN-Apt Packages\nPin-Priority: 700\n' \
+    | sudo tee /etc/apt/preferences.d/99cranapt >/dev/null
+
+  sudo apt-get update -qq
+  sudo apt-get install -y --no-install-recommends \
+    r-base-core r-cran-mirt r-cran-testthat r-cran-roxygen2 r-cran-rcmdcheck pandoc
+fi
+
+# Install the checked-out aFIPC source into the R user library so that
+# library(aFIPC) and the test suite run against the current tree.
+USERLIB=$(R_PROFILE_USER=/dev/null Rscript -e 'cat(Sys.getenv("R_LIBS_USER"))')
+mkdir -p "$USERLIB"
+R_PROFILE_USER=/dev/null R CMD INSTALL --no-multiarch --no-staged-install -l "$USERLIB" .
+
+echo "aFIPC install complete: R=$(R --version | head -1)"