diff --git a/.github/workflows/compatibility.yml b/.github/workflows/compatibility.yml
index 05a5573..b758d30 100644
--- a/.github/workflows/compatibility.yml
+++ b/.github/workflows/compatibility.yml
@@ -65,7 +65,8 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install --editable 'libs/tekton-dag-common[test]' --editable 'libs/baggage-python[test]'
-          python -m pytest libs/baggage-python/tests libs/tekton-dag-common/tests -q --tb=short
+          (cd libs/baggage-python && python -m pytest tests -q --tb=short)
+          (cd libs/tekton-dag-common && python -m pytest tests -q --tb=short)
 
   node:
     name: Node ${{ matrix.node }}
diff --git a/helm/tekton-dag/package.sh b/helm/tekton-dag/package.sh
index 5f42275..de12335 100755
--- a/helm/tekton-dag/package.sh
+++ b/helm/tekton-dag/package.sh
@@ -10,10 +10,12 @@ echo "  Repo root: $REPO_ROOT"
 
 rm -rf "$CHART_DIR/raw"
 mkdir -p "$CHART_DIR/raw/tasks" "$CHART_DIR/raw/pipelines" "$CHART_DIR/raw/stacks" \
-  "$CHART_DIR/raw/stack-crs" "$CHART_DIR/raw/team-crs"
+  "$CHART_DIR/raw/stack-crs" "$CHART_DIR/raw/team-crs" "$CHART_DIR/raw/scripts"
 
 echo "  Copying tasks..."
 cp "$REPO_ROOT"/tasks/*.yaml "$CHART_DIR/raw/tasks/"
+cp "$REPO_ROOT/scripts/run-stack-tests-runners.sh" \
+  "$CHART_DIR/raw/scripts/run-stack-tests-runners.sh"
 
 echo "  Copying pipelines and triggers..."
 cp "$REPO_ROOT"/pipeline/*.yaml "$CHART_DIR/raw/pipelines/"
diff --git a/helm/tekton-dag/templates/configmap-run-stack-tests-runners.yaml b/helm/tekton-dag/templates/configmap-run-stack-tests-runners.yaml
new file mode 100644
index 0000000..d033c57
--- /dev/null
+++ b/helm/tekton-dag/templates/configmap-run-stack-tests-runners.yaml
@@ -0,0 +1,14 @@
+{{- $script := .Files.Get "raw/scripts/run-stack-tests-runners.sh" -}}
+{{- if $script }}
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: run-stack-tests-runners
+  namespace: {{ .Values.namespace }}
+  labels:
+    app.kubernetes.io/part-of: tekton-job-standardization
+    {{- include "tekton-dag.labels" . | nindent 4 }}
+data:
+  run-stack-tests-runners.sh: |
+    {{- $script | nindent 4 }}
+{{- end }}
diff --git a/libs/tekton-dag-common/tests/test_m17_compatibility.py b/libs/tekton-dag-common/tests/test_m17_compatibility.py
index ac9208f..f13a8ae 100644
--- a/libs/tekton-dag-common/tests/test_m17_compatibility.py
+++ b/libs/tekton-dag-common/tests/test_m17_compatibility.py
@@ -17,6 +17,8 @@ def test_compatibility_workflow_covers_documented_runtimes():
     assert 'java: ["21"]' in workflow
     assert 'php: ["8.3"]' in workflow
     assert "bash scripts/check-support-matrix.sh" in workflow
+    assert "(cd libs/baggage-python && python -m pytest tests" in workflow
+    assert "(cd libs/tekton-dag-common && python -m pytest tests" in workflow
     assert 'workflow: ".github/workflows/compatibility.yml"' in matrix
 
 
diff --git a/libs/tekton-dag-common/tests/test_m17_stack_test_runners.py b/libs/tekton-dag-common/tests/test_m17_stack_test_runners.py
index 35e4efe..9eb09b4 100644
--- a/libs/tekton-dag-common/tests/test_m17_stack_test_runners.py
+++ b/libs/tekton-dag-common/tests/test_m17_stack_test_runners.py
@@ -7,11 +7,18 @@
 
 def test_task_sources_extracted_runner_script():
     task = (ROOT / "tasks/run-stack-tests.yaml").read_text()
+    installer = (ROOT / "scripts/install-tekton.sh").read_text()
+    chart = (ROOT / "helm/tekton-dag/templates/configmap-run-stack-tests-runners.yaml").read_text()
+    packager = (ROOT / "helm/tekton-dag/package.sh").read_text()
     script = (ROOT / "scripts/run-stack-tests-runners.sh").read_text()
 
-    assert "scripts/run-stack-tests-runners.sh" in task
-    assert "ERROR: run-stack-tests runners script missing" in task
+    assert "name: run-stack-tests-runners" in task
+    assert "mountPath: /opt/tekton-dag" in task
+    assert "ERROR: run-stack-tests runners ConfigMap missing" in task
     assert "PHASE 2: Per-app tests" not in task
+    assert "kubectl create configmap run-stack-tests-runners" in installer
+    assert "raw/scripts/run-stack-tests-runners.sh" in chart
+    assert "raw/scripts/run-stack-tests-runners.sh" in packager
     assert "run_newman" in script
     assert "run_playwright" in script
     assert "run_artillery" in script
diff --git a/scripts/check-helm-chart.sh b/scripts/check-helm-chart.sh
index da4eaf7..09a2cff 100644
--- a/scripts/check-helm-chart.sh
+++ b/scripts/check-helm-chart.sh
@@ -39,5 +39,16 @@ for filename in sys.argv[1:]:
     documents = [document for document in yaml.safe_load_all(path.read_text()) if document]
     if not documents:
         raise SystemExit(f"{path}: rendered no resources")
+    runners = [
+        document
+        for document in documents
+        if document.get("kind") == "ConfigMap"
+        and document.get("metadata", {}).get("name") == "run-stack-tests-runners"
+    ]
+    if not runners:
+        raise SystemExit(f"{path}: missing ConfigMap run-stack-tests-runners")
+    script = runners[0].get("data", {}).get("run-stack-tests-runners.sh", "")
+    if "run_newman" not in script:
+        raise SystemExit(f"{path}: runner ConfigMap is missing run_newman")
     print(f"{path.name}: parsed {len(documents)} resource(s)")
 PY
diff --git a/scripts/install-tekton.sh b/scripts/install-tekton.sh
index 92410b2..45be660 100755
--- a/scripts/install-tekton.sh
+++ b/scripts/install-tekton.sh
@@ -79,6 +79,9 @@ kubectl apply -f "$TEKTON_GIT_CLONE_URL" -n "$NAMESPACE" 2>/dev/null || \
 
 # 4. This repo's tasks and pipelines (kubectl apply is idempotent; triggers apply now that Triggers is installed)
 echo "  Applying stack tasks and pipelines..."
+kubectl create configmap run-stack-tests-runners \
+  --from-file=run-stack-tests-runners.sh="$MILESTONE_DIR/scripts/run-stack-tests-runners.sh" \
+  -n "$NAMESPACE" --dry-run=client -o yaml | kubectl apply -f -
 apply_with_retry -f "$MILESTONE_DIR/tasks/" -n "$NAMESPACE"
 # EventListener reconciliation creates el-* Services. It can race the explicit
 # Service in triggers.yaml between kubectl's read and create operations.
diff --git a/tasks/run-stack-tests.yaml b/tasks/run-stack-tests.yaml
index f3ebbc0..0071675 100644
--- a/tasks/run-stack-tests.yaml
+++ b/tasks/run-stack-tests.yaml
@@ -23,8 +23,9 @@ spec:
       apps this validates the PR build directly. For non-intercepted
       apps this validates they still work with the header present.
 
-    Runner logic lives in scripts/run-stack-tests-runners.sh in the
-    platform repo (cloned into the test-source workspace).
+    Runner logic lives in scripts/run-stack-tests-runners.sh and is
+    mounted from ConfigMap run-stack-tests-runners so the Task does
+    not depend on the cloned platform git-revision.
   params:
     - name: stack-json
       type: string
@@ -68,6 +69,9 @@ spec:
     - name: run-tests
       image: node:22-alpine
       workingDir: $(workspaces.test-source.path)
+      volumeMounts:
+        - name: runners-script
+          mountPath: /opt/tekton-dag
       script: |
         #!/bin/sh
         set -e
@@ -91,10 +95,14 @@ spec:
           DEFAULT_NS TESTS_TO_RUN UNMAPPED_AREA APPS_TO_TEST \
           TEST_SOURCE TEST_SUMMARY_PATH
 
-        RUNNERS="${TEST_SOURCE}/scripts/run-stack-tests-runners.sh"
+        RUNNERS="/opt/tekton-dag/run-stack-tests-runners.sh"
         if [ ! -f "$RUNNERS" ]; then
-          echo "ERROR: run-stack-tests runners script missing: $RUNNERS" >&2
+          echo "ERROR: run-stack-tests runners ConfigMap missing: $RUNNERS" >&2
           exit 1
         fi
         # shellcheck disable=SC1090
         . "$RUNNERS"
+  volumes:
+    - name: runners-script
+      configMap:
+        name: run-stack-tests-runners