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.

references/pedagogy.md

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+# Pedagogy
+
+Reuse `youtube-render-pdf` teaching order: motive → idea → mechanism → evidence → takeaway.
+
+Paper-side changes:
+
+- Cite `§` / `Eq.(n)` / Figure / Table / page, not timestamps.
+- Front page is a bibliography card, not a PDF cover screenshot.
+- Math is `\[` or `align`, never `$$`.
+- Formula three-beat: Chinese motive, display math, flat symbol list.
+- `quotebox` for a short quotation with a source; no long PDF paste.
+- End major sections with `\subsection{本章小结}`; end the notes with `\section{总结与延伸}`.
+- Figures stay outside boxes.
+
+Locked first/last titles: 「这篇论文在问什么」…「总结与延伸」, then appendix 符号表 / 推导链一览 / 图表清单.