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/outline.md

@@ -0,0 +1,17 @@
+# Outline: A One-Step Predictor
+
+## Lecture map
+
+| file | lecture_title | paper_sections | ledger_ids |
+|---|---|---|---|
+| sec-01.tex | 这篇论文在问什么 | 1 | Q1 |
+| sec-02.tex | 主张与贡献 | 1 | C1 |
+| sec-03.tex | 预备：定义、假设、符号 | 1 | D1 |
+| sec-04.tex | 一次前向与损失 | 1 | C1, DER1 |
+| sec-05.tex | 总结与延伸 | 1 | C1 |
+| sec-app-a.tex | 符号表 | — | |
+| sec-app-b.tex | 推导链一览 | — | DER1 |
+
+## Locked
+- 首节标题必须是「这篇论文在问什么」
+- 末节（appendix 前）必须是「总结与延伸」