diff --git a/changed_files.json b/changed_files.json
new file mode 100644
index 00000000..31fad1f7
--- /dev/null
+++ b/changed_files.json
@@ -0,0 +1,7 @@
+[
+  "NNS_13.0.tar.gz",
+  "NNS_13.0.zip",
+  "R/ARMA.R",
+  "src/NNS.dll",
+  "tests/testthat/Rplots.pdf"
+]
diff --git a/sync/last_live_r_parity_report.md b/sync/last_live_r_parity_report.md
new file mode 100644
index 00000000..c20a76e2
--- /dev/null
+++ b/sync/last_live_r_parity_report.md
@@ -0,0 +1,17 @@
+# Live R parity report
+
+- Plan: `sync/last_r_api_plan.json`
+- R checkout: `upstream/NNS`
+- Fresh cache requested: `False`
+- Skip install: `False`
+
+## Result: R install failed
+
+`scripts/install_local_r_nns.py` exited nonzero; live R parity could not be run.
+Exit status: `1`
+
+## Workflow step outcome
+
+- `run_live_r_parity_for_changed_api.py` step outcome: `failure`
+- Fresh cache requested: `false`
+- DESCRIPTION changed: `false`
diff --git a/sync/last_r_api_inspection.md b/sync/last_r_api_inspection.md
new file mode 100644
index 00000000..1d5062ba
--- /dev/null
+++ b/sync/last_r_api_inspection.md
@@ -0,0 +1,30 @@
+# R API parity review plan
+
+## Changed files
+
+- `NNS_13.0.tar.gz`
+- `NNS_13.0.zip`
+- `R/ARMA.R`
+- `src/NNS.dll`
+- `tests/testthat/Rplots.pdf`
+
+## Affected Python modules
+
+- `src/nns/arma.py`
+
+## Parity tests to run
+
+- `tests/parity/test_practical_examples.py`
+- `tests/parity/test_r13_smoke.py`
+
+## Cache scope
+
+- `NNS.ARMA`
+- `NNS.ARMA.optim`
+- `NNS.VAR`
+
+## Required actions
+
+- Fresh cache required: `False`
+- Export review required: `False`
+- Unmapped R files present: `False`
diff --git a/sync/last_r_api_plan.json b/sync/last_r_api_plan.json
new file mode 100644
index 00000000..551e9741
--- /dev/null
+++ b/sync/last_r_api_plan.json
@@ -0,0 +1,26 @@
+{
+  "changed_files": [
+    "NNS_13.0.tar.gz",
+    "NNS_13.0.zip",
+    "R/ARMA.R",
+    "src/NNS.dll",
+    "tests/testthat/Rplots.pdf"
+  ],
+  "affected_python_modules": [
+    "src/nns/arma.py"
+  ],
+  "parity_tests": [
+    "tests/parity/test_practical_examples.py",
+    "tests/parity/test_r13_smoke.py"
+  ],
+  "cache_scope": [
+    "NNS.ARMA",
+    "NNS.ARMA.optim",
+    "NNS.VAR"
+  ],
+  "requires_fresh_cache": false,
+  "requires_export_review": false,
+  "has_unmapped_r_files": false,
+  "unmapped_r_files": [],
+  "warnings": []
+}
diff --git a/upstream/NNS b/upstream/NNS
new file mode 160000
index 00000000..3250bc98
--- /dev/null
+++ b/upstream/NNS
@@ -0,0 +1 @@
+Subproject commit 3250bc985883e21eeb8fa4bf97656d8469de2836