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.

scripts/python

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+# Prefer the local venv so jsonschema is available without a system install.
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+if [[ -x "$ROOT/.venv/bin/python" ]]; then
+  exec "$ROOT/.venv/bin/python" "$@"
+fi
+exec python3 "$@"