Extend SecurityStrengthAdvisor to recognize SLH-DSA keys and map their
parameter sets (128/192/256) to NIST security strengths.
This enables CryptoPolicy.minStrength(...) to enforce SLH-DSA profiles
consistently with other PQC algorithms.
Signed-off-by: Leo Galambos <lg@hq.egothor.org>
SecretWithEncapsulation may zeroize internal buffers on destroy().
Create defensive copies of the shared secret and ciphertext using
Arrays.copyOf() before destroying the result object to ensure stable
output.
No cryptographic behavior changes; fixes a potential lifecycle bug.
Signed-off-by: Leo Galambos <lg@hq.egothor.org>
