test(e2e): add loadBundle CJS runner coverage

[chenjiahan]

Summary

• add a focused server e2e case for environments.node.loadBundle() on a CommonJS bundle
• verify the loaded bundle can run with dynamic import() and access runner-provided globals like queueMicrotask
• keep the case minimal by checking the /check response and the existing bundle cache behavior

Related Links

• fix(core): avoid string-built CJS runner wrapper #7485

[Copilot]

Pull request overview

Adds a new focused server e2e case to validate environments.node.loadBundle() behavior intended for CommonJS bundles, including dynamic import() execution and bundle caching.

Changes:

• Introduce a new load-bundle-cjs server e2e case with a /check route that loads and executes a node bundle via loadBundle().
• Add a CJS server entry that uses dynamic import('node:path') and checks runtime globals (queueMicrotask).
• Add an e2e test asserting the /check response and that the loaded bundle is cached (top-level log occurs once).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
e2e/cases/server/load-bundle-cjs/src/index.server.cjs	New CJS server entry used as the node environment bundle for loadBundle() execution.
e2e/cases/server/load-bundle-cjs/src/index.js	Minimal web entry for the case.
e2e/cases/server/load-bundle-cjs/rsbuild.config.ts	Adds dev-only middleware that calls server.environments.node.loadBundle('index') and returns payload from the loaded bundle.
e2e/cases/server/load-bundle-cjs/index.test.ts	Verifies response correctness and bundle caching via log count.

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[chatgpt-codex-connector]

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[gemini-code-assist]

Code Review

This pull request introduces a new E2E test case to verify the loading of CommonJS bundles with runtime globals in a server environment. However, the review feedback identifies a significant issue where the test does not actually exercise the CommonJS runner as intended; the underlying BasicRunnerFactory is currently hardcoded to always return the EsmRunner, meaning the factory logic needs to be updated to select the appropriate runner based on the file extension.