CB-185: route message status by target

fleetd/src/main/java/dev/ltms/fleet/Fleetd.java

@@ -446,7 +446,7 @@ public final class Fleetd {
             heartbeat = null;
             heartbeatScheduler.shutdownNow();
         }
-        MessageService messages = new MessageService(agents, injector, rendezvous, replyInbox,
+        MessageService messages = new MessageService(router, injector, rendezvous, replyInbox,
                 pushLoop, metrics);
 
         // Health is a slow whole-fleet observer. Keep it separate from the 250ms delivery poller.

fleetd/src/main/java/dev/ltms/fleet/msg/MessageService.java

@@ -2,6 +2,7 @@ package dev.ltms.fleet.msg;
 
 import dev.ltms.fleet.herdr.AgentControl;
 import dev.ltms.fleet.herdr.AgentStatus;
+import dev.ltms.fleet.herdr.HerdrRouter;
 import dev.ltms.fleet.inject.Injector;
 import dev.ltms.fleet.metrics.FleetMetrics;
 import dev.ltms.fleet.metrics.Metrics;
@@ -189,6 +190,7 @@ public final class MessageService {
     }
 
     private final AgentControl agents;
+    private final HerdrRouter router;
     private final Injector injector;
     private final Rendezvous rendezvous;
     private final ReplyInbox inbox;
@@ -257,6 +259,7 @@ public final class MessageService {
     MessageService(AgentControl agents, Injector injector, Rendezvous rendezvous, ReplyInbox inbox,
                    ReplyPushLoop pushLoop, Metrics metrics, LongSupplier nowNanos) {
         this.agents = agents;
+        this.router = null;
         this.injector = injector;
         this.rendezvous = rendezvous;
         this.inbox = inbox;
@@ -265,6 +268,20 @@ public final class MessageService {
         this.nowNanos = nowNanos;
     }
 
+    public MessageService(HerdrRouter router, Injector injector, Rendezvous rendezvous, ReplyInbox inbox,
+                          ReplyPushLoop pushLoop, Metrics metrics) {
+        this.agents = null;
+        this.router = router;
+        this.injector = injector;
+        this.rendezvous = rendezvous;
+        this.inbox = inbox;
+        this.pushLoop = pushLoop;
+        this.metrics = metrics;
+        this.nowNanos = System::nanoTime;
+    }
+
+    private AgentControl agentsFor(String target) { return router != null ? router.agentsFor(target) : agents; }
+
     /** Create with an explicit {@link ReplyInbox} and no push loop. */
     public MessageService(AgentControl agents, Injector injector, Rendezvous rendezvous, ReplyInbox inbox) {
         this(agents, injector, rendezvous, inbox, null);
@@ -277,7 +294,7 @@ public final class MessageService {
 
     /** Current lifecycle status of a worker (the {@code GET /sessions/{id}/status} surface). */
     public AgentStatus status(String target) {
-        return agents.status(target);
+        return agentsFor(target).status(target);
     }
 
     /** Read-only delegation fact for fleet views. */
@@ -788,7 +805,7 @@ public final class MessageService {
     /** Best-effort live worker status for a pending poll; never throws (a lookup error is just noise). */
     private String liveStatus(String target) {
         try {
-            return agents.status(target).name().toLowerCase();
+            return agentsFor(target).status(target).name().toLowerCase();
         } catch (RuntimeException e) {
             return "unknown";
         }

fleetd/src/test/java/dev/ltms/fleet/FleetdHerdrControlConstructionTest.java

@@ -0,0 +1,17 @@
+package dev.ltms.fleet;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+class FleetdHerdrControlConstructionTest {
+    @Test
+    void fleetdDelegatesStatefulControlsToTheRouter() throws Exception {
+        // AgentControl caches paneByTerminal, so the router must be its only production factory.
+        String source = Files.readString(Path.of("src/main/java/dev/ltms/fleet/Fleetd.java"));
+        assertFalse(source.contains("new AgentControl("));
+        assertFalse(source.contains("new WorkspaceControl("));
+    }
+}