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.

tests/notes-smoke/ledger.yaml

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+schema: superpaper.ledger/v1
+retired_ids: []
+paper:
+  id: smoke
+  title: Smoke
+  source: {kind: excerpt}
+coverage:
+  mode: excerpt
+questions: []
+claims:
+  - {id: C1, text: smoke, kind: contribution, status: core}
+definitions: []
+assumptions: []
+lemmas: []
+symbols:
+  - {name: x, latex: "x", meaning: "input", kind: value}
+derivations: []
+figures: []
+evidence: []
+terms: []
+source_assets: []

tests/notes-smoke/notes/notes.tex

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+\documentclass[a4paper]{article}
+\input{notes-macros}
+\renewcommand{\notetitle}{Smoke}
+\begin{document}
+\section{这篇论文在问什么}
+一段动机。
+\section{主张与贡献}
+\splabel{C1} 这是核心主张。
+\section{总结与延伸}
+结束。
+\appendix
+\section{符号表}
+\input{sections/symbols.tex}
+\end{document}