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/antipatterns.md

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+# Antipatterns
+
+- Drawing a rewrite as `\sfnode` boxes (use `align`).
+- Sending a tensor-shape claim to superfig, or an architecture to supertensor.
+- Loading a figure `.sty` in the notes so sibling warnings leak into the article log.
+- `\input` of a standalone TikZ source instead of `\spfig`.
+- Reusing a `dropped` / retired id for a new object.
+- A decorative group or arrow that is not in the ledger.