Fix CI failures: MiniRacer guard, fixture_paths, hybrid $to_json, operation timeout

- hyper-router/spec/spec_helper.rb: Guard MiniRacer backup with `defined?`
  check so specs don't crash when mini_racer gem is not installed
- hyper-component/spec/spec_helper.rb: Same MiniRacer guard + change
  `fixture_path=` to `fixture_paths=` for rspec-rails 7.x compatibility
- hyper-spec/client_execution.rb: Use hybrid JS serializer — prefers Opal's
  `$to_json` when available (handles class objects), falls back to
  `JSON.stringify` for native arrays when Opal JSON module isn't loaded
- ci.yml: Add `timeout-minutes: 30` and Opal/Sprockets asset caching to
  hyper-operation job to prevent hangs and speed up subsequent runs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: princejoseph

.github/workflows/ci.yml

@@ -47,10 +47,11 @@ jobs:
           DRIVER: github
           RAILS_ENV: test
 
-  # hyper-operation needs MySQL
+  # hyper-operation needs MySQL + Redis
   test-operation:
     name: hyper-operation
     runs-on: ubuntu-latest
+    timeout-minutes: 30
 
     services:
       mysql:
@@ -82,6 +83,14 @@ jobs:
           working-directory: ruby/hyper-operation
           bundler-cache: true
 
+      - name: Cache Opal/Sprockets assets
+        uses: actions/cache@v4
+        with:
+          path: ruby/hyper-operation/spec/test_app/tmp/cache
+          key: hyper-operation-assets-${{ hashFiles('ruby/hyper-operation/Gemfile.lock', 'ruby/hyper-operation/spec/test_app/app/**', 'ruby/**/*.rb') }}
+          restore-keys: |
+            hyper-operation-assets-
+
       - name: Prepare test app database
         run: bundle exec rake spec:prepare
         env:

ruby/hyper-component/spec/spec_helper.rb

@@ -16,7 +16,7 @@
 RSpec.configure do |config|
   config.color = true
   config.fail_fast = ENV['FAIL_FAST'] || false
-  config.fixture_path = File.join(File.expand_path(File.dirname(__FILE__)), "fixtures")
+  config.fixture_paths = [File.join(File.expand_path(File.dirname(__FILE__)), "fixtures")]
   config.infer_spec_type_from_file_location!
   config.mock_with :rspec
   config.raise_errors_for_deprecations!
@@ -31,14 +31,20 @@
   end
 
   config.before :suite do
-    MiniRacer_Backup = MiniRacer
-    Object.send(:remove_const, :MiniRacer)
+    if defined?(MiniRacer)
+      MiniRacer_Backup = MiniRacer
+      Object.send(:remove_const, :MiniRacer)
+    end
   end
 
   config.around(:each, :prerendering_on) do |example|
-    MiniRacer = MiniRacer_Backup
-    example.run
-    Object.send(:remove_const, :MiniRacer)
+    if defined?(MiniRacer_Backup)
+      MiniRacer = MiniRacer_Backup
+      example.run
+      Object.send(:remove_const, :MiniRacer)
+    else
+      example.run
+    end
   end
 
   config.filter_run_including focus: true

ruby/hyper-router/spec/spec_helper.rb

@@ -17,14 +17,20 @@
 RSpec.configure do |config|
 
   config.before :suite do
-    MiniRacer_Backup = MiniRacer
-    Object.send(:remove_const, :MiniRacer)
+    if defined?(MiniRacer)
+      MiniRacer_Backup = MiniRacer
+      Object.send(:remove_const, :MiniRacer)
+    end
   end
 
   config.around(:each, :prerendering_on) do |example|
-    MiniRacer = MiniRacer_Backup
-    example.run
-    Object.send(:remove_const, :MiniRacer)
+    if defined?(MiniRacer_Backup)
+      MiniRacer = MiniRacer_Backup
+      example.run
+      Object.send(:remove_const, :MiniRacer)
+    else
+      example.run
+    end
   end
 
   config.after :each do

ruby/hyper-spec/lib/hyper-spec/internal/client_execution.rb

@@ -30,7 +30,7 @@ def add_promise_execute_and_wait(str, opts)
             sleep 0.25
           end
         end
-        JSON.parse(page.evaluate_script('JSON.stringify(window.hyper_spec_promise_result)'), opts).first
+        JSON.parse(page.evaluate_script('(function(r){return (r && typeof r.$to_json==="function")?r.$to_json():JSON.stringify(r);})(window.hyper_spec_promise_result)'), opts).first
       end
 
       def add_promise_wrapper(str)