feat: add superfig paper-figure toolkit

Standalone LaTeX/TikZ skill for non-tensor paper figures: node/edge
macros, lint-on-warning build, golden examples, and negative fixtures.

scripts/test.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+# Build every valid example, then prove invalid TeX and lint fixtures fail.
+#
+#   ./scripts/test.sh
+set -uo pipefail
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+fail=0
+
+for f in "$ROOT"/tests/*.tex "$ROOT"/examples/*.tex; do
+  [[ -e "$f" ]] || continue
+  name="$(basename "$f")"
+  if "$ROOT/scripts/build.sh" "$f" >/dev/null 2>&1; then
+    echo "  ok    $name"
+  else
+    echo "  FAIL  $name"
+    fail=$((fail+1))
+  fi
+done
+
+for f in "$ROOT"/tests/invalid/*.tex; do
+  [[ -e "$f" ]] || continue
+  name="$(basename "$f")"
+  if SF_SKIP_LINT=1 "$ROOT/scripts/build.sh" "$f" >/dev/null 2>&1; then
+    echo "  FAIL  $name (invalid fixture built cleanly)"
+    fail=$((fail+1))
+  else
+    echo "  ok    $name (rejected by package/build)"
+  fi
+done
+
+for f in "$ROOT"/tests/lint-invalid/*.tex; do
+  [[ -e "$f" ]] || continue
+  name="$(basename "$f")"
+  if python3 "$ROOT/scripts/lint.py" "$f" >/dev/null 2>&1; then
+    echo "  FAIL  $name (invalid fixture passed lint)"
+    fail=$((fail+1))
+  else
+    echo "  ok    $name (rejected by lint)"
+  fi
+done
+
+if [[ $fail -gt 0 ]]; then
+  echo "$fail failing check(s); rerun the reported build or lint command to inspect" >&2
+  exit 1
+fi
+echo "all positive and negative checks passed"