chore: fix all clippy warnings and add Cargo.toml metadata

src/mitm/store.rs

@@ -215,8 +215,10 @@ pub struct RequestContext {
     /// API handlers wait on this with a timeout to detect match failures.
     pub gate: Arc<tokio::sync::Notify>,
     /// Debug trace handle (if tracing is enabled).
+    #[allow(dead_code)]
     pub trace_handle: Option<crate::trace::TraceHandle>,
     /// Current turn index in the trace (for multi-turn tracking).
+    #[allow(dead_code)]
     pub trace_turn: usize,
 }