fix: anchor floor on re-enable; breaker on scheduled panic; propagate next-run err; reject negative interval; close phantom runs on startup

internal/store/recovery_test.go

@@ -15,6 +15,7 @@ func TestResetRunningOnStartup(t *testing.T) {
 	// simulate a crash mid-run
 	_ = s.SetTaskStatus(ctx, taskID, "running")
 	_ = s.SetAccountStatus(ctx, accID, "running")
+	runID, _ := s.CreateRun(ctx, taskID, "manual") // phantom run: never finished
 
 	tn, an, err := s.ResetRunningOnStartup(ctx)
 	if err != nil {
@@ -31,6 +32,19 @@ func TestResetRunningOnStartup(t *testing.T) {
 	if accs[0].Status == "running" {
 		t.Fatal("account still running after reset")
 	}
+	runs, _ := s.ListRunsByTask(ctx, taskID)
+	var found bool
+	for _, r := range runs {
+		if r.ID == runID {
+			found = true
+			if r.Status == "running" || r.FinishedAt == nil {
+				t.Fatalf("phantom run %d still running: status=%s finished_at=%v", runID, r.Status, r.FinishedAt)
+			}
+		}
+	}
+	if !found {
+		t.Fatalf("run %d not found", runID)
+	}
 }
 
 func TestClearStuckAccountAndReconcile(t *testing.T) {