fix(jsontypes): handle hyphenated JSON keys in PascalCase conversion

snakeToPascal now splits on both underscores and hyphens, producing
valid Go identifiers like GenerationI, RubySapphire, BlackWhite instead
of invalid ones like Generation-i, Ruby-sapphire, Black-white.

tools/jsontypes/heuristics.go

@@ -365,7 +365,9 @@ func isUbiquitousField(name string) bool {
 
 // snakeToPascal converts snake_case or camelCase to PascalCase.
 func snakeToPascal(s string) string {
-	parts := strings.Split(s, "_")
+	parts := strings.FieldsFunc(s, func(r rune) bool {
+		return r == '_' || r == '-'
+	})
 	for i, p := range parts {
 		parts[i] = capitalize(p)
 	}