T5.7.1: Unify Verdict enum into wzp_relay::verdict, drop RepeatAbusive variant

crates/wzp-relay/src/verdict.rs

@@ -0,0 +1,12 @@
+//! Shared conformance verdict enum (Tier F / Tier G).
+
+/// Verdict produced by Tier F scoring and consumed by Tier G response policy.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Verdict {
+    /// No suspicion. Score ≥ 0.7.
+    Legitimate,
+    /// Tightened monitoring. 0.3 ≤ score < 0.7.
+    Suspect,
+    /// High confidence of abuse. Score < 0.3.
+    Abusive,
+}