diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 751656d..7f81f77 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -69,6 +69,12 @@ jobs:
           done
           curl -fsS http://localhost:8080/ | grep -q "Agentage Design System" \
             || { echo "::error::showcase did not render"; docker logs ds; exit 1; }
+          # Assert provenance here too, so a build that failed to bake COMMIT_SHA
+          # fails before prod rather than as an unexplained post-deploy timeout.
+          got="$(curl -fsS http://localhost:8080/health | grep -o '"commit":"[0-9a-f]\{7,40\}"' | cut -d'"' -f4)"
+          [ "$got" = "$GITHUB_SHA" ] \
+            || { echo "::error::/health commit '$got' != '$GITHUB_SHA'"; exit 1; }
+          echo "PASS image /health reports $got"
         env:
           GITHUB_SHA: ${{ github.sha }}
 
@@ -107,13 +113,8 @@ jobs:
         run: echo "${{ secrets.GITHUB_TOKEN }}" | ssh ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }} "docker login ghcr.io -u ${{ github.actor }} --password-stdin"
       - name: Deploy stack
         run: ssh ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }} "cd /opt/agentage/ds && docker stack deploy -c docker-compose.yml agentage-ds --with-registry-auth"
-      - name: Wait + live smoke
+      - name: Verify deploy
         env:
           SITE_FQDN: ${{ vars.SITE_FQDN }}
-        run: |
-          for i in $(seq 1 40); do
-            curl -fsS "https://${SITE_FQDN}/" 2>/dev/null | grep -q "Agentage Design System" && { ok=1; break; }
-            sleep 5
-          done
-          echo "Smoke: https://${SITE_FQDN}/"
-          [ -n "${ok:-}" ] || { echo "::error::${SITE_FQDN} never served the showcase"; exit 1; }
+          COMMIT_SHA: ${{ github.sha }}
+        run: bash scripts/verify-deploy.sh
diff --git a/CLAUDE.md b/CLAUDE.md
index 1e49566..c064a57 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -36,6 +36,7 @@ Single source of truth for the Agentage design system (OKLCH tokens + React comp
 - LIVE at https://ds.agentage.io since 2026-08-06. The `dev/` showcase deploys as its own Swarm stack (`agentage-ds`) behind Traefik on the main prod box. Dockerfile builds the static SPA → nginx-unprivileged; `docker-compose.yml` carries the Traefik labels; `.github/workflows/deploy.yml` builds → smokes → deploys on push to master.
 - Production-only (the platform-wide dev env was removed 2026-07-30). Gated on `vars.DEPLOY_ENABLED == 'true'` + the `production` environment (`vars.SITE_FQDN`, `SSH_PRIVATE_KEY` / `SSH_HOST` / `SSH_USER`).
 - Container healthcheck must probe `127.0.0.1`, not `localhost` — nginx binds IPv4 only; busybox wget picks `::1`.
+- Post-deploy verification lives in `scripts/verify-deploy.sh` (estate standard, same shape as auth/dashboard): it asserts `https://${SITE_FQDN}/health` reports **this** commit before checking that the page renders. A content grep alone is fail-open — on a failed rollout Swarm keeps the old task serving and the grep still matches.
 
 ## Conventions
 
diff --git a/scripts/verify-deploy.sh b/scripts/verify-deploy.sh
new file mode 100755
index 0000000..b1052c1
--- /dev/null
+++ b/scripts/verify-deploy.sh
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# Verify the deployed showcase from the public edge after `docker stack deploy`.
+#   1. Serves-this-commit - the image bakes COMMIT_SHA into /health, so a failed
+#      rollout (Swarm keeps the OLD task serving) can't pass silently. Prefix match.
+#   2. Renders - the SPA shell is really there, not just a live health file.
+# Ordered commit-first on purpose: the content grep alone is fail-open, since the
+# previous container answers it just as happily as the new one.
+set -euo pipefail
+
+SITE_FQDN="${SITE_FQDN:-ds.agentage.io}"
+want="${COMMIT_SHA:?COMMIT_SHA required}"
+
+# grep, not jq/python: the payload is a flat static file and the runner is
+# guaranteed nothing beyond coreutils + curl.
+read_commit() {
+  curl -sf "https://${SITE_FQDN}/health" 2>/dev/null |
+    grep -o '"commit":"[0-9a-f]\{7,40\}"' | cut -d'"' -f4 || true
+}
+
+echo "-- serves-this-commit --"
+ok=
+for i in $(seq 1 30); do
+  got="$(read_commit)"
+  case "${want}" in
+    "${got:-__none__}"*)
+      echo "PASS showcase serving ${got}"
+      ok=1
+      break
+      ;;
+  esac
+  echo "  attempt $i/30: showcase commit='${got:-<none>}' want='${want:0:12}...'"
+  [ "$i" -lt 30 ] && sleep 10
+done
+[ -n "$ok" ] || {
+  echo "::error::${SITE_FQDN} is not serving ${want} (stale task - rollout did not land)"
+  exit 1
+}
+
+echo "-- renders --"
+curl -fsS "https://${SITE_FQDN}/" | grep -q "Agentage Design System" || {
+  echo "::error::${SITE_FQDN} answered /health but did not render the showcase"
+  exit 1
+}
+echo "PASS showcase renders"
+
+echo "Deploy verified against ${SITE_FQDN} (commit ${want:0:12}...)."