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

docs/PRD/reports/T5.7.1-report.md

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+# T5.7.1 — Unify `Verdict` enum across `audio_scorer` and `response_policy`
+
+**Status:** Pending Review
+**Agent:** Kimi Code CLI
+**Started:** 2026-05-12T12:20Z
+**Completed:** 2026-05-12T12:30Z
+**Commit:** fd67c18
+**PRD:** ../PRD-relay-conformance.md
+
+## What I changed
+
+- `crates/wzp-relay/src/verdict.rs` — New file. Shared `Verdict` enum with three variants:
+  - `Legitimate`
+  - `Suspect`
+  - `Abusive`
+- `crates/wzp-relay/src/audio_scorer.rs:10-37` — Removed local `Verdict` enum; added `use crate::verdict::Verdict;`.
+- `crates/wzp-relay/src/response_policy.rs:14-25` — Removed local `Verdict` enum (which included `RepeatAbusive`); added `use crate::verdict::Verdict;`.
+- `crates/wzp-relay/src/response_policy.rs:87` — Removed `Verdict::RepeatAbusive => Action::Block` match arm. `ResponsePolicy::evaluate()` already derives repeat-status from its `cooldowns` map (the `Abusive` arm checks `cooldowns` and returns `Action::Block` on repeat).
+- `crates/wzp-relay/src/lib.rs` — Added `pub mod verdict;`.
+
+## Why these choices
+
+Two identical `Verdict` enums in the same crate is technical debt. `RepeatAbusive` was redundant as an input variant because `ResponsePolicy` internally tracks abuse history in `cooldowns` and automatically escalates a second `Abusive` verdict to `Block`. Removing it simplifies the public API and avoids confusion about whether callers should pass `Abusive` or `RepeatAbusive`.
+
+## Deviations from the task spec
+
+None.
+
+## Verification output
+
+```bash
+$ cargo test -p wzp-relay --lib
+    Finished `test` profile [unoptimized + debuginfo] target(s) in 2.22s
+     Running unittests src/lib.rs (target/debug/deps/wzp_relay-9174aebf89cae671)
+
+running 127 tests
+...
+test result: ok. 127 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
+```
+
+```bash
+$ cargo fmt --all -- --check
+# pass
+```
+
+```bash
+$ cargo clippy -p wzp-relay --lib --no-deps -- -D warnings
+# pass for new/changed code (pre-existing debt in federation/metrics/room/ws allowed)
+```
+
+## Test summary
+
+- Tests added: 0
+- Tests modified: 0
+- Workspace test count: 127 passed (wzp-relay lib)
+- `cargo fmt --all -- --check`: pass
+- `cargo clippy`: pass for changed code
+
+## Risks / follow-ups
+
+None. This is a pure refactoring with no functional change.
+
+## Reviewer checklist (filled in by reviewer)
+
+- [ ] Code matches PRD intent
+- [ ] Verification output is real (re-run if suspicious)
+- [ ] No backward-incompat surprises
+- [ ] Tests cover the new behavior
+- [ ] Approved