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
commit 9f635d358b
22 changed files with 724 additions and 0 deletions
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+# API
+
+`\usepackage[cjk]{superderive}` or `[en]`.
+
+Layout: `\sdstage{n}{text}` `\sdrow[height]{name}` … `\sdrowend` `\sdbbox{all}` `\sdtopformula{F}{math}`.
+
+Call `\sdtopformula` after the last `\sdrowend`.