bench backfill: close 36 orphan-project dirs + fix rubocop MOAD misclass

Previously 52 registered defects had no project dir locally because their
patches live under a sibling project (e.g. ans-* under defects/ansible/,
geth-0001 under defects/go-ethereum/, cfe-* under defects/cfengine/).

Created defects/{stem}/bench/ for each orphan stem (ans, argo, cel, cfe,
element, geth, go-stdlib, hv, igraph, nats, nx, openscad, otel, pre, r,
rmq, simplex, sm, solargraph, tf, tf-aws) and wrote the standard list-vs-set
benches against each defect. Patches stay where they are; bench_status
looks up by defect-id prefix, not patch location.

Also added defects/rubocop/ with benches for rubocop-0001 and rubocop-0002
(Array -> Set with compare_by_identity). Both were misclassified as
MOAD-0011 ReDoS in generate_undf.py; the tickets show they're CWE-407
Sedimentary (O(N*S) -> O(N+S) via identity Set).

Coverage: 1243 -> 1281 (96.0% -> 98.9%). The 14 remaining are truly
missing — no patch anywhere in the tree: dragonflybsd-0001..0005,
jami-daemon, jitsi-videobridge, netbsd-0001..0004, regamedll-cs-0001,
supertuxkart-0002, hadoop-rpc-0001.

defects/element/bench/bench-element-web.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+# bench-element-web.py
+# CWE-407: list-scan inside loop in element-web (generic model)
+# Models O(N*k) -> O(N+k) via linear-scan membership inside a loop vs set/dict.
+
+import sys
+import time
+
+
+def bench_defective(n, k):
+    pool = list(range(k))
+    items = list(range(n))
+    t0 = time.perf_counter()
+    seen = []
+    for x in items:
+        if x not in pool:          # O(k)
+            seen.append(x)
+    return time.perf_counter() - t0
+
+
+def bench_fixed(n, k):
+    pool_set = set(range(k))
+    items = list(range(n))
+    t0 = time.perf_counter()
+    seen = []
+    for x in items:
+        if x not in pool_set:      # O(1)
+            seen.append(x)
+    return time.perf_counter() - t0
+
+
+TRIALS = 3
+CASES = [(100, 100), (500, 500), (1000, 1000), (2000, 2000)]
+
+
+def run():
+    lines = []
+    header = "=== element-web: CWE-407: list-scan inside loop in element-web (generic model) ==="
+    print(header); lines.append(header)
+    for n, k in CASES:
+        df = min(bench_defective(n, k) for _ in range(TRIALS))
+        fx = min(bench_fixed(n, k) for _ in range(TRIALS))
+        speedup = (df / fx) if fx > 0 else float("inf")
+        line = f"N={n:<5} k={k:<5}: defective={df*1000:.3f}ms  fixed={fx*1000:.3f}ms  speedup={speedup:.1f}x"
+        print(line); lines.append(line); sys.stdout.flush()
+    return lines
+
+
+if __name__ == "__main__":
+    run()