Fix single generation tests

[thinklanguages]

Summary

• keep mocks active between tests in single generation test suite
• ensure NuclenStartGeneration uses stubbed nuclenFetchWithRetry

Testing

• composer lint (fails: composer not installed)
• composer test (fails: composer not installed)
• npx vitest run tests/frontend/nuclen-admin-single-generation.test.ts (fails: npm registry blocked)

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https://chatgpt.com/codex/tasks/task_e_685d21ef313083278859ff6dd6057f55

Description by Korbit AI

What change is being made?

Enhance test mocking by adding a new mock implementation for NuclenStartGeneration and replace vi.restoreAllMocks() with vi.clearAllMocks() in the test cleanup.

Why are these changes being made?

This change ensures that the NuclenStartGeneration function is properly mocked (allowing controlled test scenarios for asynchronous calls) and uses vi.clearAllMocks() instead of vi.restoreAllMocks() to clean up only the mocks set during the test without affecting any global mock state, which maintains test isolation and improves reliability.

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[korbit-ai]

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