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/router.md

@@ -0,0 +1,14 @@
+# Router
+
+Authority: `scripts/router.py`. `suggest()` returns a **class**, not a toolkit.
+
+| class | signals (any hit) | accepted toolkits |
+|---|---|---|
+| `numeric` | loss-curve, bar, scatter, histogram, numeric-plot | screenshot, matplotlib |
+| `raster` | table, photo, apparatus, ui | screenshot |
+| `tensor` | axis, shape, transpose, broadcast, gather, shard, contraction, face | supertensor |
+| `fig` | architecture, pipeline, data-flow, state, time, dependency, what-eats-what, argument-map | superfig |
+| `derive` | rewrite-figure, cancel-visual, subst-visual | v1: align |
+| `none` | otherwise | none |
+
+Mixed classes on one row → `SP011`. Split with the next integer ids. Default: do not draw.