fix local run startup and stale dispatch

platform/service/distributions_test.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"strings"
 	"testing"
+	"time"
 
 	"browser.local/platform/domain"
 	"browser.local/platform/repo"
@@ -96,6 +97,31 @@ func TestCoreServiceGeneratesRunDistributionWithEncryptedSingletonKey(t *testing
 	}
 }
 
+func TestCoreServiceRejectsDistributionBuildForStaleRunEndpoint(t *testing.T) {
+	svc, session, instance := newDistributionTestFixture(t)
+	svc.now = func() time.Time { return fixedTime.Add(capacityHeartbeatStaleAfter + time.Second) }
+
+	_, err := svc.GenerateRunDistributionForSession(session, domain.RunDistributionGenerateRequest{
+		ServerInstanceID: instance.ID,
+		TargetOS:         "linux",
+		TargetArch:       "amd64",
+		IdempotencyKey:   "idem-stale-run-endpoint",
+	})
+	if err == nil || !strings.Contains(err.Error(), "heartbeat is stale") {
+		t.Fatalf("expected stale Run endpoint rejection, got %v", err)
+	}
+
+	actions, err := svc.GetServerRuntimeActionsForSession(session, instance.ID)
+	if err != nil {
+		t.Fatalf("get runtime actions: %v", err)
+	}
+	for _, action := range actions.Actions {
+		if action.Key == "generate-run" && action.Available {
+			t.Fatalf("stale Run endpoint must not expose generate-run as available: %+v", action)
+		}
+	}
+}
+
 func TestCoreServiceRuntimeActionsGateDependenciesOnPluginPermission(t *testing.T) {
 	svc, session, instance := newDistributionTestFixture(t)
 	plugin, err := svc.store.GamePlugins().Get(instance.PluginID)