Fix RSpec examples.txt persistence file path configuration

The spec_helper.rb was using a relative path "spec/examples.txt" which
created the file relative to the current working directory. When tests
were run from the monorepo root, this created a spec/ directory at the
root level (which shouldn't exist with the new structure).

Fixed by using File.join(__dir__, "../examples.txt") to create the file
relative to the spec_helper's location, ensuring it goes in
react_on_rails/spec/examples.txt regardless of the working directory.

Also added /spec/ to .gitignore to prevent the root-level directory from
being tracked if accidentally created.

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

Co-Authored-By: Claude <[email protected]>

Author: justin808

.gitignore

@@ -9,6 +9,9 @@ coverage/
 *.gem
 /vendor/
 
+# Root-level spec directory (should not exist with monorepo structure)
+/spec/
+
 react_on_rails/spec/examples.txt
 react_on_rails/spec/react_on_rails/dummy-for-generators/
 react_on_rails_pro/spec/examples.txt

react_on_rails/spec/react_on_rails/spec_helper.rb

@@ -45,7 +45,7 @@
 RSpec.configure do |config|
   Rails.logger = Logger.new($stdout)
 
-  config.example_status_persistence_file_path = "spec/examples.txt"
+  config.example_status_persistence_file_path = File.join(__dir__, "../examples.txt")
   config.run_all_when_everything_filtered = true
 
   # rspec-expectations config goes here. You can use an alternate