100% test coverage.

[samuel-williams-shopify]

Summary

• add Covered policy configuration excluding examples
• add focused tests for command, environment, middleware, service, endpoint, and executable rescue paths
• add direct requires needed by isolated tests

Tests

• bundle exec sus test/falcon/command.rb test/falcon/command/proxy.rb test/falcon/middleware/proxy.rb
• bundle exec bake covered:validate --minimum 1.0