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 @@
+$QK^\top \to QK^\top/\sqrt{d_k}$。缩放压方差，避免 softmax 饱和。
				`@@ -0,0 +1 @@`
				`$QK^\top \to QK^\top/\sqrt{d_k}$。缩放压方差，避免 softmax 饱和。`