feat: land superpaper v1 notes scaffold

Add the ledger schema, class router, lint codes, ingest/build
pipeline, and three work-tree examples: align derivation,
superfig delegation, and supertensor delegation.

scripts/build.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# Lint, project the ledger, compile notes. Overfull is logged, not fatal.
+#   ./scripts/build.sh --work <dir>
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+WORK=""
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --work|--out) WORK="$2"; shift 2 ;;
+    *) echo "usage: build.sh --work DIR" >&2; exit 2 ;;
+  esac
+done
+[[ -n "$WORK" ]] || { echo "usage: build.sh --work DIR" >&2; exit 2; }
+WORK="$(cd "$WORK" && pwd)"
+NOTES="$WORK/notes"
+[[ -f "$WORK/ledger.yaml" ]] || { echo "no ledger.yaml in $WORK" >&2; exit 2; }
+[[ -f "$NOTES/notes.tex" ]] || { echo "no notes/notes.tex in $WORK" >&2; exit 2; }
+
+echo "==> lint"
+"$ROOT/scripts/python" "$ROOT/scripts/lint.py" --work "$WORK"
+
+echo "==> render ledger"
+"$ROOT/scripts/python" "$ROOT/scripts/render_ledger.py" --work "$WORK"
+
+mkdir -p "$WORK/out"
+echo "==> xelatex"
+(
+  cd "$NOTES"
+  export TEXINPUTS="$ROOT/assets:$NOTES:"
+  xelatex -halt-on-error -interaction=nonstopmode notes.tex >/dev/null
+  xelatex -halt-on-error -interaction=nonstopmode notes.tex >/dev/null
+)
+
+LOG="$NOTES/notes.log"
+status=0
+if grep -q "Missing character" "$LOG"; then
+  echo "!! missing glyphs:" >&2
+  grep -m5 "Missing character" "$LOG" >&2
+  status=1
+fi
+if grep -qE "LaTeX Warning: (Reference|Citation|There were undefined references|Label\(s\) may have changed)" "$LOG"; then
+  if grep -q "undefined" "$LOG"; then
+    echo "!! undefined references:" >&2
+    grep -m5 "undefined" "$LOG" >&2 || true
+    status=1
+  fi
+fi
+if grep -q "multiply-defined" "$LOG"; then
+  echo "!! multiply-defined labels:" >&2
+  grep -m5 "multiply-defined" "$LOG" >&2
+  status=1
+fi
+if grep -qE "^(Overfull|Underfull) \\\\[hv]box" "$LOG"; then
+  echo "==> overfull/underfull (recorded, not fatal)"
+  grep -m5 -E "^(Overfull|Underfull) \\\\[hv]box" "$LOG" || true
+fi
+
+cp -f "$NOTES/notes.pdf" "$WORK/out/notes.pdf"
+echo "==> $WORK/out/notes.pdf"
+exit $status