Consistently use ClassMethods sub-module for prepending class methods

Library/Homebrew/extend/os/linux/cask/quarantine.rb

@@ -5,6 +5,7 @@ module OS
   module Linux
     module Cask
       module Quarantine
+        module ClassMethods
           extend T::Helpers
 
           requires_ancestor { ::Cask::Quarantine }
@@ -18,5 +19,6 @@ module OS
       end
     end
   end
+end
 
-Cask::Quarantine.singleton_class.prepend(OS::Linux::Cask::Quarantine)
+Cask::Quarantine.singleton_class.prepend(OS::Linux::Cask::Quarantine::ClassMethods)

Library/Homebrew/extend/os/linux/development_tools.rb

@@ -4,6 +4,7 @@
 module OS
   module Linux
     module DevelopmentTools
+      module ClassMethods
         extend T::Helpers
 
         requires_ancestor { ::DevelopmentTools }
@@ -68,5 +69,6 @@ module OS
       end
     end
   end
+end
 
-DevelopmentTools.singleton_class.prepend(OS::Linux::DevelopmentTools)
+DevelopmentTools.singleton_class.prepend(OS::Linux::DevelopmentTools::ClassMethods)

Library/Homebrew/extend/os/linux/simulate_system.rb

@@ -4,6 +4,7 @@
 module OS
   module Linux
     module SimulateSystem
+      module ClassMethods
         sig { returns(T.nilable(Symbol)) }
         def os
           @os ||= T.let(nil, T.nilable(Symbol))
@@ -24,5 +25,6 @@ module OS
       end
     end
   end
+end
 
-Homebrew::SimulateSystem.singleton_class.prepend(OS::Linux::SimulateSystem)
+Homebrew::SimulateSystem.singleton_class.prepend(OS::Linux::SimulateSystem::ClassMethods)

Library/Homebrew/extend/os/mac/development_tools.rb

@@ -6,6 +6,7 @@ require "os/mac/xcode"
 module OS
   module Mac
     module DevelopmentTools
+      module ClassMethods
         extend T::Helpers
 
         requires_ancestor { ::DevelopmentTools }
@@ -87,5 +88,6 @@ module OS
       end
     end
   end
+end
 
-DevelopmentTools.singleton_class.prepend(OS::Mac::DevelopmentTools)
+DevelopmentTools.singleton_class.prepend(OS::Mac::DevelopmentTools::ClassMethods)

Library/Homebrew/extend/os/mac/hardware/cpu.rb

@@ -7,6 +7,7 @@ module OS
   module Mac
     module Hardware
       module CPU
+        module ClassMethods
           extend T::Helpers
 
           # These methods use info spewed out by sysctl.
@@ -55,8 +56,9 @@ module OS
       end
     end
   end
+end
 
-Hardware::CPU.singleton_class.prepend(OS::Mac::Hardware::CPU)
+Hardware::CPU.singleton_class.prepend(OS::Mac::Hardware::CPU::ClassMethods)
 
 module Hardware
   class CPU

Library/Homebrew/extend/os/mac/readall.rb

@@ -4,6 +4,7 @@
 module OS
   module Mac
     module Readall
+      module ClassMethods
         extend T::Helpers
 
         requires_ancestor { Kernel }
@@ -43,5 +44,6 @@ module OS
       end
     end
   end
+end
 
-Readall.singleton_class.prepend(OS::Mac::Readall)
+Readall.singleton_class.prepend(OS::Mac::Readall::ClassMethods)

Library/Homebrew/extend/os/mac/simulate_system.rb

@@ -4,6 +4,7 @@
 module OS
   module Mac
     module SimulateSystem
+      module ClassMethods
         sig { returns(T::Boolean) }
         def simulating_or_running_on_macos?
           return true if Homebrew::SimulateSystem.os.blank?
@@ -18,5 +19,6 @@ module OS
       end
     end
   end
+end
 
-Homebrew::SimulateSystem.singleton_class.prepend(OS::Mac::SimulateSystem)
+Homebrew::SimulateSystem.singleton_class.prepend(OS::Mac::SimulateSystem::ClassMethods)

Library/Homebrew/extend/os/mac/utils/socket.rb

@@ -7,6 +7,7 @@ module OS
   module Mac
     # Wrapper around UNIXSocket to allow > 104 characters on macOS.
     module UNIXSocketExt
+      module ClassMethods
         extend T::Helpers
 
         requires_ancestor { Kernel }
@@ -26,5 +27,6 @@ module OS
       end
     end
   end
+end
 
-Utils::UNIXSocketExt.singleton_class.prepend(OS::Mac::UNIXSocketExt)
+Utils::UNIXSocketExt.singleton_class.prepend(OS::Mac::UNIXSocketExt::ClassMethods)