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.

examples/excerpt-toy/notes/notes.tex

@@ -0,0 +1,29 @@
+\documentclass[a4paper]{article}
+\input{notes-macros}
+\renewcommand{\notetitle}{一次前向预测器}
+\renewcommand{\noteauthors}{Superpaper fixture}
+\renewcommand{\notepaper}{A One-Step Predictor}
+\renewcommand{\notevenue}{examples/excerpt-toy}
+\begin{document}
+\begin{titlepage}
+\centering
+\vspace{2cm}
+{\huge\bfseries \notetitle\par}
+\vspace{1cm}
+{\large \notepaper\par}
+\vspace{0.5cm}
+{\large \noteauthors\par}
+\end{titlepage}
+\tableofcontents
+\newpage
+\input{sections/sec-01.tex}
+\input{sections/sec-02.tex}
+\input{sections/sec-03.tex}
+\input{sections/sec-04.tex}
+\input{sections/sec-05.tex}
+\appendix
+\section{符号表}
+\input{sections/symbols.tex}
+\section{推导链一览}
+DER1：缩放来自方差，见 \spref{C1}。
+\end{document}