Remove Conductor-specific files for separate PR

Per code review feedback:
- Removed spec/dummy/TESTING_LOCALLY.md (mentions async which is Pro-only)
- Removed spec/dummy/spec/rails_helper.local.rb.example
- Reverted spec/dummy/spec/rails_helper.rb to remove local config loading

These files will be moved to a separate PR focused on local testing setup.

Author: justin808

spec/dummy/TESTING_LOCALLY.md

@@ -15,11 +15,6 @@
 require "capybara/rails"
 require "capybara-screenshot/rspec"
 
-# Load local test configuration if it exists (for Conductor workspaces, etc.)
-# This file is gitignored and can contain environment-specific workarounds
-local_config = File.expand_path("rails_helper.local.rb", __dir__)
-require local_config if File.exist?(local_config)
-
 # Add additional requires below this line. Rails is not loaded until this point!
 
 # Requires supporting ruby files with custom matchers and macros, etc, in