Persist QUIC fabric closed evictions

agents/rap-node-agent/internal/mesh/fabric_quic_transport.go

@@ -354,6 +354,7 @@ func (t *QUICFabricTransport) Snapshot() QUICFabricTransportSnapshot {
 		select {
 		case <-entry.conn.Context().Done():
 			delete(t.conns, key)
+			t.stats.ClosedEvicted++
 			snapshot.Stats.ClosedEvicted++
 		default:
 			snapshot.ActiveCount++

agents/rap-node-agent/internal/mesh/fabric_quic_transport_test.go

@@ -235,6 +235,51 @@ func TestQUICFabricTransportPrunesIdleConnections(t *testing.T) {
 	}
 }
 
+func TestQUICFabricTransportSnapshotPersistsClosedEvictions(t *testing.T) {
+	server, err := StartQUICFabricServer(context.Background(), QUICFabricServerConfig{
+		ListenAddr: "127.0.0.1:0",
+		TLSConfig:  testQUICTLSConfig(t),
+	})
+	if err != nil {
+		t.Fatalf("start quic fabric server: %v", err)
+	}
+	defer server.Close()
+
+	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancel()
+	transport := NewQUICFabricTransport(nil)
+	defer transport.Close()
+	target := FabricTransportTarget{
+		PeerID:   "node-b",
+		Endpoint: server.Addr().String(),
+		TLSConfig: &tls.Config{
+			InsecureSkipVerify: true,
+			NextProtos:         []string{fabricQUICNextProto},
+		},
+		Timeout: time.Second,
+	}
+	session, err := transport.Connect(ctx, target)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	defer session.Close()
+	key := quicFabricConnKey(target)
+	transport.mu.Lock()
+	entry := transport.conns[key]
+	transport.mu.Unlock()
+	if entry == nil || entry.conn == nil {
+		t.Fatalf("cached connection missing")
+	}
+	_ = entry.conn.CloseWithError(0, "test closed")
+	<-entry.conn.Context().Done()
+
+	first := transport.Snapshot()
+	second := transport.Snapshot()
+	if first.Stats.ClosedEvicted != 1 || second.Stats.ClosedEvicted != 1 {
+		t.Fatalf("closed eviction stats were not persisted: first=%+v second=%+v", first, second)
+	}
+}
+
 func TestQUICFabricTransportLimitsStreamsPerConnection(t *testing.T) {
 	server, err := StartQUICFabricServer(context.Background(), QUICFabricServerConfig{
 		ListenAddr: "127.0.0.1:0",

docs/architecture/DISTRIBUTED_FABRIC_NODE_PROTOCOL_PLAN.md

@@ -418,6 +418,9 @@ stream id as well, so gateway status can compare TX and RX distribution under
 browser/RDP load.
 QUIC fabric transport snapshots expose the configured stream limit, saturated
 connection count, and capacity pressure percentage next to stream limit rejects.
+Closed cached QUIC connections discovered during snapshot generation now update
+the transport's cumulative eviction counters, keeping successive heartbeats
+consistent.
 Endpoint ranking treats `capacity_limited` observations as a soft pressure
 penalty instead of a hard recent failure, enabling load spreading without
 marking the carrier unhealthy.