Document LatentMoE sigmoid routing, sparse dispatch, and K3 block figures

Ledger C10–C12 match the permute-pad-bmm path and Switch aux/z-loss.
Section 8 adds overview and component TikZ; MoE capacity is C_moe so it
does not collide with KDA chunk size.

notes/notes-macros.tex

@@ -10,6 +10,7 @@
 \usepackage{subcaption}
 \usepackage{float}
 \usepackage{tikz}
+\usetikzlibrary{positioning, arrows.meta, decorations.pathreplacing, calc}
 \usepackage{hyperref}
 \usepackage{xcolor}
 \usepackage{multicol}