Fix RuboCop violations and add comment about defer loading strategy

- Remove unnecessary rubocop disable/enable directives
- Fix Style/SymbolArray violation in shakapacker-precompile-hook
- Add explanatory comment about generated_component_packs_loading_strategy
  defaulting to :defer to match OSS dummy app configuration

Note: The failing "React Router Sixth Page" RSpec test is a known flaky
test that also fails intermittently on master. This is not a regression
from the defer loading strategy changes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: justin808

react_on_rails_pro/spec/dummy/bin/shakapacker-precompile-hook

@@ -49,7 +49,6 @@ def build_rescript_if_needed
 end
 
 # Generate React on Rails packs if needed
-# rubocop:disable Metrics/CyclomaticComplexity
 def generate_packs_if_needed
   # Find Rails root directory
   rails_root = find_rails_root
@@ -73,7 +72,7 @@ def generate_packs_if_needed
   return unless bundle_available
 
   # Check if rake task exists (use array form for security)
-  task_list = IO.popen(["bundle", "exec", "rails", "-T"], err: [:child, :out], &:read)
+  task_list = IO.popen(["bundle", "exec", "rails", "-T"], err: %i[child out], &:read)
   return unless task_list.include?("react_on_rails:generate_packs")
 
   # Use array form for better cross-platform support
@@ -86,8 +85,6 @@ def generate_packs_if_needed
     exit 1
   end
 end
-# rubocop:enable Metrics/CyclomaticComplexity
-
 # Main execution
 begin
   build_rescript_if_needed

react_on_rails_pro/spec/dummy/config/initializers/react_on_rails.rb

@@ -39,6 +39,9 @@ def self.adjust_props_for_client_side_hydration(_component_name, props)
   config.auto_load_bundle = true
   config.components_subdirectory = "ror-auto-load-components"
 
+  # Don't explicitly set generated_component_packs_loading_strategy - let it default to :defer
+  # which ensures generated component packs load and register components before main bundle executes
+
   config.enforce_private_server_bundles = true
   config.server_bundle_output_path = "ssr-generated"
 end