Rename result type in some docs and tests

[dmontagu]

No description provided.

[hyperlint-ai]

PR Change Summary

Renamed the result type in documentation and tests for clarity and consistency.

• Renamed 'NeverResultType' to 'NeverOutputType' in the documentation.
• Updated the agent configuration to use 'NeverOutputType' instead of 'NeverResultType'.

Modified Files

• docs/agents.md

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