feat: harness VM stack (runner, measure-db, blackbox, Alloy, k6) and the 12 scenarios

Experiment design 5 and 7 for the harness VM (10.20.0.11): vm/harness/apply.sh pulls the secrets from Secret Manager,
compose runs runner:de076a7, measure-db, blackbox, Alloy (probe_success -> Mimir) and k6 under the campaign profile.
Scenario files C-K1..X-M2 are loaded by the runner. Harness ClusterRole gains replicasets get/list for rollout undo.

vm/harness/scenarios/C-K1.yaml

@@ -0,0 +1,24 @@
+# design 7 C-K1: known signature, container. PodChaos pod-kill one api pod; ReplicaSet recreates it, PDB keeps the SLO.
+id: C-K1
+path: known
+asset: container
+expected_layer: 1
+ground_truth_label: api_pod_killed
+ground_truth_action: none
+description: PodChaos pod-kill, mode one, selector app=api
+inject:
+  method: chaos
+  manifest: |
+    apiVersion: chaos-mesh.org/v1alpha1
+    kind: PodChaos
+    metadata:
+      namespace: chaos-mesh
+    spec:
+      action: pod-kill
+      mode: one
+      selector:
+        namespaces: [demo]
+        labelSelectors:
+          app: api
+revert:
+  method: chaos_delete