ax(ueps): replace prose comment with usage example on ThreatScore default

AX Principle 2: comments must show concrete usage, not prose rationale.
"Assumed innocent until proven guilty" explains intent but shows no usage.
Replaced with a concrete mutation example per the RFC convention.

Co-Authored-By: Charon <charon@lethean.io>

pkg/ueps/packet.go

@@ -53,7 +53,7 @@ func NewPacketBuilder(intentID uint8, payload []byte) *PacketBuilder {
 			CurrentLayer: 5,    // Application
 			TargetLayer:  5,    // Application
 			IntentID:     intentID,
-			ThreatScore:  0, // Assumed innocent until proven guilty
+			ThreatScore:  0, // builder.Header.ThreatScore = 100 // elevated threat; 0 = clean
 		},
 		Payload: payload,
 	}