feat: start on a blank container — spawn with empty:true and no repo (skip clone, default worker image); Spawn UI enables blank spawn without repo selection

daemon/spawner_test.go

@@ -1348,3 +1348,24 @@ func TestSpawnerEmptyScratch(t *testing.T) {
 		t.Fatalf("sessions volume missing: %v", binds)
 	}
 }
+
+func TestSpawnerEmptyScratchNoRepo(t *testing.T) {
+	f := newFakeDocker()
+	sp, _ := newTestSpawner(t, f)
+
+	res, err := sp.Start(context.Background(), "", "", "", true)
+	if err != nil {
+		t.Fatalf("Start with no repo: %v", err)
+	}
+	waitJobState(t, sp, res.SessionID, stateRunning)
+	creates := f.createsByName("lvmh-agent-")
+	if len(creates) != 1 {
+		t.Fatalf("creates = %d, want 1", len(creates))
+	}
+	for _, b := range creates[0].HostConfig.Binds {
+		if b == "lvmh-sessions:/pi-sessions" || b == "lvmh-pi-cache:/root/.pi/agent/cache" {
+			continue
+		}
+		t.Fatalf("blank spawn must mount no repo volume: %v", creates[0].HostConfig.Binds)
+	}
+}