diff --git a/.Rbuildignore b/.Rbuildignore
index 232504f0..8989c62f 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -5,6 +5,8 @@
 ^\.Rprofile$
 ^\.github$
 ^\.github/.*
+^\.cursor$
+^\.cursor/.*
 ^\.codegraph$
 ^\.codegraph/.*
 ^.*\.Rcheck$
diff --git a/.cursor/environment.json b/.cursor/environment.json
new file mode 100644
index 00000000..1951d4eb
--- /dev/null
+++ b/.cursor/environment.json
@@ -0,0 +1,4 @@
+{
+  "name": "aFIPC",
+  "install": "bash .cursor/install.sh"
+}
diff --git a/.cursor/install.sh b/.cursor/install.sh
new file mode 100755
index 00000000..4f41758b
--- /dev/null
+++ b/.cursor/install.sh
@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+# Cloud Agent install step for the aFIPC R package.
+#
+# Provisions CRAN-release R and the CRAN dependencies used by documented
+# verification (mirt, testthat, rcmdcheck, roxygen2). This step must stay
+# revision-agnostic: with environment builds, `install` is snapshotted and is
+# not rerun on later checkouts, so this script must not `R CMD INSTALL` the
+# current tree (that would freeze library(aFIPC) at the build revision).
+# Agents should use testthat::test_local() / rcmdcheck against the checkout.
+#
+# R comes from the CRAN "release" channel (matching r.yml). CRAN packages
+# come from r2u as prebuilt Ubuntu binaries so mirt is not compiled from source.
+set -euo pipefail
+
+toolchain_ready() {
+  command -v R >/dev/null 2>&1 || return 1
+  R_PROFILE_USER=/dev/null Rscript -e '
+    pkgs <- c("mirt", "testthat", "roxygen2", "rcmdcheck")
+    q(status = if (all(pkgs %in% rownames(installed.packages()))) 0 else 1)
+  ' >/dev/null 2>&1
+}
+
+if ! toolchain_ready; then
+  # shellcheck source=/dev/null
+  . /etc/os-release
+  ARCH="$(dpkg --print-architecture)"
+  # CRAN's Ubuntu channel is "<codename>-cran40/" (e.g. noble-cran40).
+  CRAN_SUITE="${VERSION_CODENAME}-cran40"
+
+  sudo apt-get update -qq
+  sudo apt-get install -y --no-install-recommends wget ca-certificates gnupg dirmngr
+
+  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=${ARCH}] https://cloud.r-project.org/bin/linux/ubuntu ${CRAN_SUITE}/" \
+    | sudo tee /etc/apt/sources.list.d/cran_r.list
+
+  wget -q -O- https://eddelbuettel.github.io/r2u/assets/dirk_eddelbuettel_key.asc \
+    | sudo tee /etc/apt/trusted.gpg.d/cranapt_key.asc >/dev/null
+  echo "deb [arch=${ARCH}] https://r2u.stat.illinois.edu/ubuntu ${VERSION_CODENAME} main" \
+    | sudo tee /etc/apt/sources.list.d/cranapt.list
+  printf 'Package: *\nPin: release o=CRAN-Apt Project\nPin: release l=CRAN-Apt Packages\nPin-Priority: 700\n' \
+    | sudo tee /etc/apt/preferences.d/99cranapt >/dev/null
+
+  sudo apt-get update -qq
+  sudo apt-get install -y --no-install-recommends \
+    r-base-core r-cran-mirt r-cran-testthat r-cran-roxygen2 r-cran-rcmdcheck pandoc
+fi
+
+echo "aFIPC toolchain ready: R=$(R --version | head -1)"
diff --git a/AGENTS.md b/AGENTS.md
index b60b03df..63f46ef4 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -19,6 +19,9 @@ parameter calibration and test linking.
 - Keep `.github/dependabot.yml` active for GitHub Actions updates.
 - Keep `ARCHITECTURE.md` up to date when structure changes.
 - Keep README accurate for local verification commands.
+- Keep `.cursor/install.sh` revision-agnostic: provision R + CRAN deps only.
+  Do not `R CMD INSTALL` the current tree in `install` (environment builds
+  freeze that copy). Use `testthat::test_local()` / `rcmdcheck` on the checkout.
 
 ## Editing priorities
 
diff --git a/ARCHITECTURE.md b/ARCHITECTURE.md
index 3880f15c..59672533 100644
--- a/ARCHITECTURE.md
+++ b/ARCHITECTURE.md
@@ -19,6 +19,7 @@ metadata and CI are wired, and which parts are safe to evolve.
 - `.github/ISSUE_TEMPLATE/` - structured issue intake templates
 - `.github/CODEOWNERS` - code ownership map for reviews
 - `.github/dependabot.yml` - Automated Actions dependency updates
+- `.cursor/` - Cloud Agent environment (`environment.json` + `install.sh`)
 - `docs/coderabbit/review-commands.md` - CodeRabbit command quick reference
 - `docs/operations/maintenance-runbook.md` - recurring maintainer operations checklist
 - `README.md` - User/developer entrypoint
@@ -91,6 +92,10 @@ package metadata, and CI workflow definitions in Git.
 - Primary check: `R CMD check` via GitHub Actions
 - Local check command:
   - `Rscript -e 'rcmdcheck::rcmdcheck(args = c("--no-manual", "--as-cran"))'`
+- Cloud Agent: `.cursor/environment.json` runs `.cursor/install.sh` to provision
+  CRAN-release R and r2u binaries (`mirt`, `testthat`, `roxygen2`, `rcmdcheck`).
+  `install` is snapshot-scoped and must not `R CMD INSTALL` the current tree;
+  use `testthat::test_local()` / `rcmdcheck` against the checkout.
 
 ## 9. Future Considerations / Roadmap
 
@@ -103,9 +108,9 @@ package metadata, and CI workflow definitions in Git.
 ## 10. Project Identification
 
 - Project Name: aFIPC
-- Repository URL: `https://github.com/seonghobae/aFIPC`
+- Repository URL: `https://github.com/ContextualWisdomLab/aFIPC`
 - Primary Contact: Seongho Bae
-- Date of Last Update: 2026-02-15
+- Date of Last Update: 2026-08-16
 
 ## 11. Glossary / Acronyms
 
diff --git a/CLAUDE.md b/CLAUDE.md
index 264efb15..6a11a23e 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -78,6 +78,8 @@ See `ARCHITECTURE.md` for the full map. Essentials:
 - `.github/workflows/` — `r.yml` (R CMD check), `code-quality.yml`
   (yamllint + markdownlint + actionlint), `security-audit.yml` (gitleaks +
   actionlint). All action refs are pinned to full commit SHAs.
+- `.cursor/` — Cloud Agent environment. `install.sh` provisions R + CRAN
+  deps only; do not `R CMD INSTALL` the current tree there.
 
 Runtime is single-process and fileless: in-memory old/new form data ->
 `autoFIPC()` -> `mirt` calibration -> optional item parameter drift (IPD)