Update Fitch trick solutions.

Co-authored-by: Cursor <cursoragent@cursor.com>

clean-latex-junk.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+DRY_RUN=0
+
+usage() {
+  cat <<'USAGE'
+Usage: ./clean-latex-junk.sh [--dry-run]
+
+Removes common LaTeX build byproducts from this repository, recursively.
+Source files and PDFs are not removed.
+
+Options:
+  --dry-run   Print files that would be removed without deleting them.
+  -h, --help  Show this help.
+USAGE
+}
+
+for arg in "$@"; do
+  case "$arg" in
+    --dry-run) DRY_RUN=1 ;;
+    -h|--help) usage; exit 0 ;;
+    *) echo "Unknown option: $arg" >&2; usage; exit 2 ;;
+  esac
+done
+
+patterns=(
+  "*.aux"
+  "*.bcf"
+  "*.blg"
+  "*.fdb_latexmk"
+  "*.fls"
+  "*.lof"
+  "*.log"
+  "*.lot"
+  "*.nav"
+  "*.out"
+  "*.run.xml"
+  "*.snm"
+  "*.synctex.gz"
+  "*.toc"
+  "*.vrb"
+  "*.xdv"
+)
+
+files=()
+while IFS= read -r -d '' file; do
+  files+=("$file")
+done < <(
+  find "$ROOT" \
+    \( -path "$ROOT/.git" -o -path "$ROOT/.cursor" \) -prune \
+    -o -type f \
+    \( \
+      -name "${patterns[0]}" \
+      -o -name "${patterns[1]}" \
+      -o -name "${patterns[2]}" \
+      -o -name "${patterns[3]}" \
+      -o -name "${patterns[4]}" \
+      -o -name "${patterns[5]}" \
+      -o -name "${patterns[6]}" \
+      -o -name "${patterns[7]}" \
+      -o -name "${patterns[8]}" \
+      -o -name "${patterns[9]}" \
+      -o -name "${patterns[10]}" \
+      -o -name "${patterns[11]}" \
+      -o -name "${patterns[12]}" \
+      -o -name "${patterns[13]}" \
+      -o -name "${patterns[14]}" \
+      -o -name "${patterns[15]}" \
+    \) -print0
+)
+
+if ((${#files[@]} == 0)); then
+  echo "No LaTeX build byproducts found."
+  exit 0
+fi
+
+if ((DRY_RUN)); then
+  echo "Would remove ${#files[@]} LaTeX build byproduct(s):"
+  printf '  %s\n' "${files[@]#$ROOT/}"
+  exit 0
+fi
+
+printf 'Removing %s LaTeX build byproduct(s):\n' "${#files[@]}"
+printf '  %s\n' "${files[@]#$ROOT/}"
+rm -f -- "${files[@]}"
+echo "Done."