Cypress is not defined error with @shelex/cypress-allure-plugin reporter (Cypress 13.x/15.x, Allure 2.29.0+)

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Description:
I am unable to use the @shelex/cypress-allure-plugin reporter with Cypress. I have tried multiple versions (Cypress 13.17.0, 15.4.0 and Allure plugin 2.29.0, 2.41.2, latest), but always get the following error when running npx cypress run:

Steps to Reproduce:

1. Install Cypress and @shelex/cypress-allure-plugin (tried multiple versions).
2. Use the following config in
   const { defineConfig } = require('cypress');
   const allureWriter = require('@shelex/cypress-allure-plugin/writer');
   module.exports = defineConfig({
   e2e: {
   setupNodeEvents(on, config) {
   allureWriter(on, config);
   return config;
   },
   specPattern: 'cypress/e2e/**/*.cy.js',
   supportFile: 'cypress/support/e2e.js',
   },
   reporter: '@shelex/cypress-allure-plugin',
   reporterOptions: { resultsDir: 'allure-results' },
   });
3. Add import '@shelex/cypress-allure-plugin'; to e2e.js.
4. Run npx cypress run.

Expected:
Cypress runs and generates Allure results.

Actual:
Fails with "Cypress is not defined" error.

Environment:

OS: Windows 11
Cypress: 13.17.0, 15.4.0 (tried both)
@shelex/cypress-allure-plugin: 2.29.0, 2.41.2, latest (tried all)
Node.js: [your version]
Additional Info:

Works if I comment out the reporter in config.
Tried clearing cache, reinstalling, and all known workarounds.