diff --git a/Test/E2E/chain/run_chain_e2e.sh b/Test/E2E/chain/run_chain_e2e.sh
index f0470db..65f6d9d 100755
--- a/Test/E2E/chain/run_chain_e2e.sh
+++ b/Test/E2E/chain/run_chain_e2e.sh
@@ -10,7 +10,9 @@
 # against the analytic/fed oracle, renders plots, and aggregates results.json.
 # Artifacts: Build/x86-linux/E2E/chain/ (report) and /tmp/chain_e2e/ (scratch).
 #
-# Usage: ./run_chain_e2e.sh [--skip-build] [--only <id>] [--pdf-only]
+# Usage: ./run_chain_e2e.sh [--skip-build] [--only <id>] [--pdf-only] [--cpp-coverage] [--stress]
+# --stress also runs the capacity matrix (stress.py / stress_run.py) and embeds a
+# Stress Tests section (table + per-axis scaling curves) in the PDF.
 set -u
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
@@ -25,13 +27,15 @@ SKIP_BUILD=0
 ONLY=""
 PDF_ONLY=0
 CPP_COV=0
+STRESS=0
 while [ $# -gt 0 ]; do
     case "$1" in
         --skip-build) SKIP_BUILD=1 ;;
         --only) shift; ONLY="$1" ;;
         --pdf-only) PDF_ONLY=1 ;;
         --cpp-coverage) CPP_COV=1 ;;
-        --help|-h) echo "Usage: $0 [--skip-build] [--only <id>] [--pdf-only] [--cpp-coverage]"; exit 0 ;;
+        --stress) STRESS=1 ;;
+        --help|-h) echo "Usage: $0 [--skip-build] [--only <id>] [--pdf-only] [--cpp-coverage] [--stress]"; exit 0 ;;
         *) echo "unknown arg $1" >&2; exit 2 ;;
     esac
     shift
@@ -271,9 +275,25 @@ if [ "${CPP_COV}" -eq 1 ]; then
     (cd "${SCRIPT_DIR}/client" && go build -o chain-client . >/dev/null 2>&1) || true
 fi
 
+# ── Stress matrix (opt-in) ───────────────────────────────────────────────────
+# Capacity sibling of the correctness phase: sweep one load axis at a time and
+# gate survival/liveness (hard) + RSS/zoom-p95 (soft). Writes stress_results.json
+# into OUT_DIR/stress, which report_build.py folds into the PDF when present.
+STRESS_OUT="${OUT_DIR}/stress"
+if [ "${STRESS}" -eq 1 ]; then
+    echo ""
+    echo "── Stress matrix ──"
+    mkdir -p "${STRESS_OUT}"
+    ${PY} "${SCRIPT_DIR}/stress.py" >/dev/null || { echo "stress matrix invalid"; exit 1; }
+    ${PY} "${SCRIPT_DIR}/stress_run.py" \
+        --marte "${MARTE_APP}" --hub "${STREAMHUB_EX}" --client "${CLIENT}" \
+        --work "${WORK}" --out "${STRESS_OUT}" || true
+fi
+
 # ── Consolidated report data (+ history/regression + trend plots) ────────────
 ${PY} "${SCRIPT_DIR}/report_build.py" --repo "${REPO_ROOT}" \
-    --results "${OUT_DIR}/results.json" --work "${WORK}" --out "${OUT_DIR}" || true
+    --results "${OUT_DIR}/results.json" --work "${WORK}" --out "${OUT_DIR}" \
+    --stress-results "${OUT_DIR}/stress/stress_results.json" || true
 
 # ── PDF ──────────────────────────────────────────────────────────────────────
 if command -v typst >/dev/null 2>&1 && [ -f "${SCRIPT_DIR}/E2E_Report.typ" ]; then