add(tests): bounded conformance suite for the reducer against the relational semantics (golden corpus)

scripts/difftest.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$ROOT"
+
+if ! command -v rocq >/dev/null 2>&1; then
+  if command -v opam >/dev/null 2>&1; then
+    eval "$(opam env --switch=rocq-system --set-switch 2>/dev/null || true)"
+  fi
+fi
+
+if ! command -v rocq >/dev/null 2>&1; then
+  echo "rocq not on PATH; run: eval \$(opam env --switch=rocq-system --set-switch)" >&2
+  exit 1
+fi
+
+dune build
+./scripts/audit.sh
+echo "CONFORMANCE OK: 7 term corpus checked against the relational semantics by theory/Tests.v"
+echo "DIFFTEST OK"