Use correct interface

[kibertoad]

Changes

We should not rely on implementation here, high level interface is more flexible

Additionally, fixed universal-testing-utils tests broken by MSW 2.13.x:

• MSW 2.13.x added an invariant that prevents calling server.listen() on an already-enabled server
• The test was calling server.listen() in beforeEach, which fails on the second test since the server is already listening
• Changed to beforeAll to match the standard MSW lifecycle pattern (beforeAll/afterAll for listen/close, afterEach for resetHandlers)
• Updated README example to reflect the corrected pattern

Checklist

• Apply one of following labels; major, minor, patch or skip-release
• I've updated the documentation, or no changes were necessary
• I've updated the tests, or no changes were necessary

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📝 Walkthrough

Walkthrough

The pull request updates type annotations in the MSW testing utility module, replacing SetupServerApi with SetupServer across multiple method signatures and an exported type. The changes affect the MockEndpointParams type definition and five public methods of the MswHelper class: mockValidResponse, mockValidResponseWithAnyPath, mockValidResponseWithImplementation, mockAnyResponse, and mockSseStream. No functional logic or runtime behavior is altered.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Use correct interface' directly aligns with the main change: replacing SetupServerApi with SetupServer for a more flexible, high-level interface.
Description check	✅ Passed	The pull request description comprehensively covers changes, includes detailed technical explanations, and addresses all required checklist items with checkmarks.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/mock-interface

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