feat: make RSpecHelpers inclusion opt-in

Stop auto-including CodeTeams::RSpecHelpers; clients can include it in their own
RSpec config. The testing integration remains opt-in via requiring code_teams/rspec.

Author: joemsak

lib/code_teams/rspec.rb

@@ -5,6 +5,8 @@
 require 'securerandom'
 require 'code_teams/testing'
 
+CodeTeams::Testing.enable!
+
 module CodeTeams
   module RSpecHelpers
     def code_team_with_config(team_config = {})
@@ -17,8 +19,6 @@ def code_team_with_config(team_config = {})
 
 if defined?(RSpec)
   RSpec.configure do |config|
-    config.include CodeTeams::RSpecHelpers
-
     config.around do |example|
       example.run
       # Bust caches because plugins may hang onto stale data between examples.

lib/code_teams/testing.rb

@@ -14,6 +14,15 @@ module Testing
     extend T::Sig
 
     THREAD_KEY = T.let(:__code_teams_collection, Symbol)
+    @enabled = T.let(false, T::Boolean)
+
+    sig { void }
+    def self.enable!
+      return if @enabled
+
+      CodeTeams.prepend(CodeTeamsExtension)
+      @enabled = true
+    end
 
     sig { params(attributes: T::Hash[T.untyped, T.untyped]).returns(CodeTeams::Team) }
     def self.create_code_team(attributes)
@@ -82,5 +91,3 @@ def find(name)
     end
   end
 end
-
-CodeTeams.prepend(CodeTeams::Testing::CodeTeamsExtension)

spec/lib/code_teams/r_spec_helpers_integration_spec.rb

@@ -1,6 +1,8 @@
 require 'code_teams/rspec'
 
 RSpec.describe CodeTeams::RSpecHelpers do
+  include described_class
+
   it 'exposes code_team_with_config and makes the team discoverable' do
     code_team_with_config(name: 'RSpec Team')