feat: add superderive child and open phase-2 routing

Attach the stepwise derivation toolkit as a submodule and default SUPERPAPER_PHASE to 2 so rewrite-figure can use superderive. Notes still keep align for short expansions without cancel or subst.
2026-08-17 10:06:39 +08:00
parent 3a322aa8dc
commit e6918ffa35
24 changed files with 659 additions and 12 deletions
@@ -0,0 +1,2 @@
+\section{这篇论文在问什么}
+注意力里的 $1/\sqrt{d_k}$ 是装饰，还是一次必须看见的改写？