- Make all packages Expl3.

- Replace ifthen dependency with wrappers for Latex3 conditionals.
- Debug CrossRef and WrapBoxout.

packages/Branch.sty

@@ -0,0 +1,20 @@
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesExplPackage{PrimeTeX/packages/Branch}{2025-09-18}{1.0}{
+	LaTeX2e-syntax wrappers for LaTeX3 branch commands.
+}
+
+\NewDocumentCommand{\If}{m +m +O{}}{
+	\bool_if:nTF {#1} {#2} {#3}
+}
+
+\NewDocumentCommand{\Compare}{o m o}{
+	\bool_if:nTF {\tl_if_novalue_p:n {#1} || \tl_if_novalue_p:n {#3}} {
+		\dim_compare_p:n {#2}
+	} {
+		\dim_compare_p:nNn {#1} #2 {#3}
+	}
+}
+
+\NewDocumentCommand{\Switch}{m +m +O{} +O{}}{
+	\int_case:nnTF {#1} {#2} {#3} {#4}
+}