Audit Rails error reporting API integration points

[kitcommerce]

Summary

• audit Workarea's Rails 7.1 error reporting integration points and document the compatibility result
• add a focused Workarea::ErrorReporting test covering forwarding, Rails-API absence, and reporter failure swallowing
• update the migration note with the audited touchpoints and explicit compatibility/client-impact guidance

Findings

• Core Workarea only touches Rails 7.1 error reporting through Workarea::ErrorReporting, an availability-guarded wrapper around Rails.error.report
• The wrapper is currently used only for handled exceptions in LatestVersion, PingHomeBase, and Checkout::Fraud::Analyzer
• Storefront 500 handling still exposes request.env['rack.exception'], so Rack/middleware-based reporters continue to work unchanged
• No core ActiveSupport::ErrorReporter subscribers, provider-specific integrations, or downstream extension-point breaks were found

Client impact

• None expected. Host apps and plugins can keep their existing reporting setup; config.error_reporter adoption remains additive and optional.

Verification

• searched the repo for Rails.error, ActiveSupport::ErrorReporter, error_reporter, reporter, and related exception-reporting hooks
• reviewed the concrete integration points in:
  • core/lib/workarea/error_reporting.rb
  • core/lib/workarea/latest_version.rb
  • core/lib/workarea/ping_home_base.rb
  • core/app/models/workarea/checkout/fraud/analyzer.rb
  • storefront/app/controllers/workarea/storefront/errors_controller.rb
• added core/test/lib/workarea/error_reporting_test.rb for the wrapper behavior audit coverage
• ran ruby -c core/lib/workarea/error_reporting.rb
• ran ruby -c core/test/lib/workarea/error_reporting_test.rb
• attempted to run targeted bundled tests, but the repo's existing gemspec declaration (s.required_ruby_version = '>= 2.7.0, < 3.5.0') is currently rejected by the local Bundler/RubyGems environment before the test suite boots

Refs #1138