CB-512: wire bridged_push_nudges_total metric increments

bridged/src/test/java/dev/ltms/bridged/msg/ReplyPushLoopTest.java

@@ -5,6 +5,8 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import dev.ltms.bridged.herdr.AgentControl;
 import dev.ltms.bridged.herdr.HerdrClient;
 import dev.ltms.bridged.mcp.PrimaryRegistry;
+import dev.ltms.bridged.metrics.BridgedMetrics;
+import dev.ltms.bridged.metrics.Metrics;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -183,6 +185,39 @@ class ReplyPushLoopTest {
         assertTrue(nudge.contains("bridge_poll(target=term_worker)"));
     }
 
+    // --- metrics (CB-512) ----------------------------------------------------------------------
+
+    @Test
+    void successfulNudgeIncrementsDelivered() throws Exception {
+        var rec = recordingClient();
+        agents = new AgentControl(rec);
+        inbox.publish(WORKER, "m1", "hello");
+        Metrics metrics = new Metrics();
+
+        loop(1, 50, metrics).onReplyQueued(WORKER);
+
+        assertTrue(rec.sendLatch.await(3, TimeUnit.SECONDS),
+                "one nudge (2 agent.send calls) should have been sent");
+        // The delivered count is bumped on the scheduler thread right after the send that releases
+        // the latch — settle briefly so the counter is published before we read it.
+        Thread.sleep(200);
+        assertEquals(1, metrics.count(BridgedMetrics.PUSH_NUDGES, "outcome", "delivered"),
+                "a successfully sent nudge must count as delivered");
+    }
+
+    @Test
+    void reminderCapIncrementsExhausted() {
+        agents = agentWithStatus("idle");
+        inbox.publish(WORKER, "m1", "hello");
+        Metrics metrics = new Metrics();
+
+        assertEquals(ReplyPushLoop.Action.STOP, loop(2, 100, metrics).decide(WORKER, 2));
+
+        assertEquals(1, metrics.count(BridgedMetrics.PUSH_NUDGES, "outcome", "exhausted"),
+                "hitting the reminder cap must count as exhausted");
+        assertEquals(0, metrics.count(BridgedMetrics.PUSH_NUDGES, "outcome", "delivered"));
+    }
+
     // --- helpers -------------------------------------------------------------------------------
 
     private ReplyPushLoop loop() {
@@ -193,6 +228,10 @@ class ReplyPushLoopTest {
         return new ReplyPushLoop(registry, agents, inbox, scheduler, maxReminders, backoffMs);
     }
 
+    private ReplyPushLoop loop(int maxReminders, long backoffMs, Metrics metrics) {
+        return new ReplyPushLoop(registry, agents, inbox, scheduler, maxReminders, backoffMs, metrics);
+    }
+
     private static AgentControl agentWithStatus(String status) {
         return new AgentControl(new FakeHerdrClient(status));
     }