Add comprehensive test coverage for generic result system

[Copilot]

Lite PR

Summary

• Added 28 unit tests covering all builder functions, type guards, and edge cases in the generic result system
• Added JSDoc documentation for all public APIs
• Organized example files into dedicated examples/ directory

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Why

• Addresses automated review feedback requesting test coverage for the new result system introduced in PR feat(ensnode-sdk): define a generic Result type #1539
• Ensures correctness and prevents regressions in critical error handling infrastructure

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Testing

• All 28 tests pass
• Test coverage includes:
  • Builder functions for all error types (InternalServerError, NotFound, InvalidRequest, ConnectionError, RequestTimeout)
  • isRecognizedResultCodeForOperation function with various inputs
  • buildResultClientUnrecognizedOperationResult edge cases (null handling, type validation, extra field filtering)
  • Default values and parameter variations
• Linting and type checking pass across all packages

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Pre-Review Checklist (Blocking)

• This PR does not introduce significant changes and is low-risk to review quickly.
• Relevant changesets are included (or are not required)

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Latest commit: 37b14fc

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Project	Deployment	Review	Updated (UTC)
admin.ensnode.io	Ready	Preview, Comment	Jan 17, 2026 4:59pm
ensnode.io	Ready	Preview, Comment	Jan 17, 2026 4:59pm
ensrainbow.io	Ready	Preview, Comment	Jan 17, 2026 4:59pm

[tk-o]

@copilot this PR has unresolved conflicts. In case you still want to propose some updates, please resolve the conflicts. Otherwise, feel free to close the PR.

[Copilot]

@copilot this PR has unresolved conflicts. In case you still want to propose some updates, please resolve the conflicts. Otherwise, feel free to close the PR.

This PR has already been merged into feat/ensnode-result-type as commit ce0e754. The conflict exists because the base branch has additional changes after the merge. This PR can be safely closed.