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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+# Style
+
+Palette `sdTeal #4F8FA5` `sdOrange #EE995B` `sdCoral #C95B5B` `sdViolet #8A74B5` `sdGray #85898F`. One hue per role. ≤4 active hues plus gray. Lightness `30/55/80`.