Add finished Series filter; clock-driven hygiene predicates exclude it (#159)

backend/internal/web/admin_series.go

@@ -20,10 +20,10 @@ import (
 // the wrong page. The store does not export it (#140).
 const seriesPageSize = 50
 
-// seriesFilterLabels names every hygiene filter for the Series list select,
-// keyed by the wire constant the URL carries. The render order is
-// seriesFilterOrder; the labels are read by later admin tickets too, so the
-// map and the constants cannot drift apart.
+// seriesFilterLabels names every Series filter for the list select, keyed by
+// the wire constant the URL carries. The render order is seriesFilterOrder;
+// the labels are read by later admin tickets too, so the map and the
+// constants cannot drift apart.
 var seriesFilterLabels = map[string]string{
 	store.SeriesFilterAll:          "All series",
 	store.SeriesFilterNoURL:        "No series URL",
@@ -33,10 +33,13 @@ var seriesFilterLabels = map[string]string{
 	store.SeriesFilterStale:        "Not checked in 12h",
 	store.SeriesFilterNoCover:      "No cover",
 	store.SeriesFilterReaderReport: "Latest from a Reader",
+	store.SeriesFilterFinished:     "Finished",
 }
 
 // seriesFilterOrder is the select's render order: All first, then the
-// permanent repairs, then the fixable ones (issue #140).
+// permanent repairs, then the fixable ones (issue #140). Finished rides the
+// tail, last — deliberate, not a repair — and the Overview's stats block
+// renders the same tail, which is what sits the finished figure last there.
 var seriesFilterOrder = []string{
 	store.SeriesFilterAll,
 	store.SeriesFilterNoURL,
@@ -46,6 +49,7 @@ var seriesFilterOrder = []string{
 	store.SeriesFilterStale,
 	store.SeriesFilterNoCover,
 	store.SeriesFilterReaderReport,
+	store.SeriesFilterFinished,
 }
 
 // seriesListView is the Series list page's data. The template renders strings
@@ -611,9 +615,9 @@ func (h *Handler) seriesListView(r *http.Request) (seriesListView, error) {
 	return view, nil
 }
 
-// seriesFilterOptions renders every hygiene filter with its library-wide
-// count, one SeriesShapes pass per filter summed in Go — the shipped surface
-// offers eight grouped passes, not a single stats query (#140). The counts
+// seriesFilterOptions renders every filter with its library-wide count, one
+// SeriesShapes pass per filter summed in Go — the shipped surface offers nine
+// grouped passes, not a single stats query (#140). The counts
 // are library-wide because the select sits next to the Site narrowing and
 // must not shift as the owner narrows the list itself. Cutoff travels with
 // the stale filter, or its count would always be zero.