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Body Context: My development server (`./bin/dev`) failed to boot, reporting `FactoryBot::DuplicateDefinitionError: Factory already registered: learning`. Cause: The `factory_bot_rails` gem was included in the `group :development, :test do` block in the `Gemfile`. This caused FactoryBot's Railtie to load factory definitions (`spec/factories/*.rb`) during development environment initialization (e.g., via Spring or initial boot), potentially conflicting with other initializers or running twice. Resolution: I moved `gem "factory_bot_rails"` exclusively to the `group :test do` block in the `Gemfile` and ran `rbenv exec bundle install`. Learning: I learned that gems intended solely for testing (like `factory_bot_rails`, `shoulda-matchers`, `capybara`) should typically only be included in the `:test` group in the `Gemfile`. Including them in `:development` can lead to unexpected behavior, errors during server startup, or unnecessary loading as their initializers might run inappropriately or cause conflicts.

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