style: заменить короткие имена переменных

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

pkg/adapters/crypto/x25519/x25519.go

@@ -136,8 +136,8 @@ func (k *kemAdapter) Decapsulate(
 
 	// Reject the all-zero public key (identity point), which yields an all-zero shared secret.
 	allZero := true
-	for _, b := range ciphertext {
-		if b != 0 {
+	for _, byteValue := range ciphertext {
+		if byteValue != 0 {
 			allZero = false
 			break
 		}