single-node-chaos-hardening: remove PDB existence check (irrelevant to memory-pressure eviction)

chaos-hardening-remove-pdb-check.patch

--- a/tasks/single-node-chaos-hardening/grader.py
+++ b/tasks/single-node-chaos-hardening/grader.py
@@ -130,13 +130,6 @@ def validate_setup():
     if node_taints and not affinity_issues_found:
         feedback.append("All Tier 1/2 workloads compatible with node taints")

-    # --- PDB Existence Check ---
-    print("validating PDB existence")
-    for ns in ["argocd", "bleater", "monitoring"]:
-        rc, out = run(f"kubectl get pdb -n {ns} -o json")
-        pdbs = safe_json(out).get("items", []) if rc == 0 else []
-        if not pdbs:
-            feedback.append(f"Namespace {ns} has no PodDisruptionBudgets")
-            all_ok = False
-
     return {"all_ok": all_ok, "feedback": feedback}