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/ledger.md

@@ -0,0 +1,9 @@
+# Ledger
+
+SSOT is `ledger.yaml`. Schema: `assets/ledger.schema.yaml`. Empty template: `assets/ledger.example.yaml`.
+
+Write the ledger before any `sections/*.tex`. Ids are `C1`, `Q1`, `D1`, `A1`, `L1`, `E1`, `DER1`, `F1`, `SA1` — no `F1a`. Retired ids go in `retired_ids`.
+
+`symbols[].kind` aliases (`activation` → `value`, `shape-parameter` → `shape parameter`, …) are normalized in `scripts/lint.py` **before** `SP001`. Canonical list is the schema enum.
+
+v1 derivations use `figure: null` and `align` in the notes. Do not invent a figure for a four-step rewrite.