feat: add superderive stepwise derivation figures

A third sibling toolkit: rewrite steps, justification rails, cancel/substitute highlights, and lint-on-warning builds.
2026-08-17 10:05:03 +08:00
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+# superderive
+
+Stepwise algebraic derivation figures. Third sibling of `superfig` /
+`supertensor`. Same muted palette and lint-on-warning build. The
+primitives are rewrite steps, not nodes or tensor faces.
+
+This repository is a **child** of SuperPaper. Clone SuperPaper with
+`--recurse-submodules` for the family; use this directory alone when
+you only need a derivation figure.
+
+```
+SKILL.md
+assets/superderive.sty
+scripts/{preflight,lint,build,test}
+examples/rewrite-cancel.tex
+```
+
+```bash
+./scripts/preflight.sh
+./scripts/build.sh examples/rewrite-cancel.tex
+./scripts/test.sh
+```
+
+Provenance: specified in SuperPaper `DESIGN.md` Layer 2. Not grown
+out of `superfig.sty`.