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Add test suite covering thread-safe random number generator with tests for: - Constructor with various seed values (positive, zero, negative) - Deterministic behavior verification with same seeds - Permutation generation and validation - Concurrent access safety with multiple goroutines - Mixed operations under concurrent load Also clarify package documentation to explicitly state this is for load balancing and server selection, not cryptographic use. The math/rand usage is intentional for performance in non-security contexts like upstream server selection and DNS record shuffling. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>