feat: Add example rows to `ValidationError` for all rule failures#286

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Copilot wants to merge 3 commits intomainfrom

copilot/enhance-validation-error-message

Commits on Feb 28, 2026

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Copilot
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feat: enhance primary_key ValidationError with distinct combinations and examples

Copilot
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borchero
committed
feat: extend examples to all rules in both eager and lazy validation paths

Copilot
and
borchero
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