go-cluster: traefik-0001/nats-server-0001 CWE-407; grafana/consul/containerd/buildkit/helm/cayley CLEAN

traefik-0001: CheckRecursion slices.Contains on growing stack O(D²) → O(D) with parallel map
nats-server-0001: checkConsumerCfg subject filter overlap double-loop O(S²) → O(S²/2)
grafana: CLEAN (gonum topo sort, map visited sets throughout)
consul: CLEAN (discoverychain map[string]struct{} visited)
containerd: CLEAN (walkBlobVariantsOnly map[digest]struct{})
buildkit: CLEAN (addItemToStorage map[*item] visited)
helm: CLEAN (resolver single-pass, dep list O(D) display-only)
cayley: CLEAN (Recursive.Next map[interface{}]seenAt)

defects/cayley/patch/CLEAN.md

@@ -0,0 +1,17 @@
+# cayley — CWE-407 Scan Result: CLEAN
+
+Scanned: 2026-03-29
+
+## Scope
+
+- `graph/iterator/recursive.go` — `Recursive.Next`: uses `map[interface{}]seenAt` for visited
+  tracking. The `seen[key]` lookup is O(1) hash map. BFS/DFS traversal is O(V+E). Correct.
+- `graph/iterator/fixed.go` — `Fixed.Contains`: linear scan over fixed set, but only used for
+  small seed sets, not in an outer loop.
+- All `Contains` methods in iterator package: graph iterator interface, not list-membership
+  inside outer traversal loops.
+
+## Verdict
+
+No CWE-407 defects found. Cayley's recursive graph iterator uses a proper `map[interface{}]seenAt`
+hash map for cycle detection and visited-node tracking.