fix: skip at_exit when framework adapter handles finalization

README.md

@@ -196,7 +196,7 @@ Comparisons add ~50ms per image with VIPS. Without `ruby-vips`, ChunkyPNG is use
 
 ## Installation
 
-**Requirements:** Ruby 3.2+. Rails 7.1+ for Rails integration; non-Rails projects supported via `CapybaraScreenshotDiff.serve()`. For the `:vips` driver: [libvips 8.9+](https://libvips.github.io/libvips/install.html).
+**Requirements:** Ruby 3.2+. Rails 7.1+ for Rails integration; non-Rails projects supported via `CapybaraScreenshotDiff.serve()`. For the `:vips` driver: [libvips 8.9+](https://libvips.github.io/libvips/install.html). On macOS: `brew install vips`. On Ubuntu: `apt-get install libvips-dev`.
 
 ## Docs
 

docs/framework-setup.md

@@ -74,4 +74,14 @@ Then('I should not see any visual difference') do
 end
 ```
 
+## Custom Test Frameworks
+
+Minitest, RSpec, and Cucumber are supported out of the box. For other frameworks, call `finalize_reporters!` in your framework's "after suite" hook:
+
+```ruby
+CapybaraScreenshotDiff.finalize_reporters!
+```
+
+This generates the HTML report and prints the summary.
+
 [← Back to README](../README.md)

lib/capybara_screenshot_diff/reporters/html.rb

@@ -129,13 +129,9 @@ def write_report
   end
 end
 
-# Auto-register reporter and at_exit hook.
-# The reporter only writes when there are failures (finalize checks failures.empty?).
-# Scripts that create their own reporter instance call record/finalize directly.
+# Auto-register reporter.
+# Framework adapters (Minitest, RSpec, Cucumber) call finalize_reporters! via native hooks.
+# For custom frameworks, call CapybaraScreenshotDiff.finalize_reporters! manually.
 unless CapybaraScreenshotDiff.reporters.any?(CapybaraScreenshotDiff::Reporters::HTML)
   CapybaraScreenshotDiff.reporters << CapybaraScreenshotDiff::Reporters::HTML.new(embed_images: !!ENV["CI"])
 end
-
-# Fallback for frameworks without explicit integration (e.g., Cucumber).
-# Minitest and RSpec adapters call finalize_reporters! via their native hooks.
-at_exit { CapybaraScreenshotDiff.finalize_reporters! }