Struct validation backed by go-playground/validator/v10 with xerrors integration and pluggable i18n message providers. What's included: - Validator interface with Struct(v any) error method - New(...Option) constructor with WithMessageProvider functional option - MessageProvider interface for i18n; DefaultMessages (EN) and SpanishMessages (ES) built in - ValidationErrors mapped to xerrors.ErrInvalidInput with field and tag context keys - InvalidValidationError (non-struct input) mapped to xerrors.ErrInternal - Full playground.ValidationErrors attached via WithError for callers needing all failures Tested-via: todo-api POC integration Reviewed-against: docs/adr/
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