Add near-term report identity

internal/state/filesystem_test.go

@@ -305,6 +305,21 @@ func TestFindPriorSnapshotSupportsNarrowedWeekendPeriod(t *testing.T) {
 	}
 }
 
+func TestFindPriorSnapshotIgnoresRollingWindowReports(t *testing.T) {
+	store := newTestStore(t)
+	first := resolveNearTermAt(t, "2026-05-29T05:00:00-05:00")
+	second := resolveNearTermAt(t, "2026-05-29T06:00:00-05:00")
+	savePriorMetadata(t, store, first, stateBriefingMetadata(first))
+
+	prior, err := store.FindPriorSnapshot(context.Background(), second)
+	if err != nil {
+		t.Fatalf("FindPriorSnapshot() error = %v", err)
+	}
+	if prior != nil {
+		t.Fatalf("FindPriorSnapshot() = %#v, want nil for rolling-window comparison", prior)
+	}
+}
+
 func TestFilesystemStoreRejectsUnsafeDirs(t *testing.T) {
 	cfg := config.Defaults().Workspace
 	cfg.Root = t.TempDir()
@@ -390,6 +405,26 @@ func resolveWeekendAt(t *testing.T, value string) report.Resolved {
 	return resolved
 }
 
+func resolveNearTermAt(t *testing.T, value string) report.Resolved {
+	t.Helper()
+	location, err := timeutil.LoadLocation("America/Chicago")
+	if err != nil {
+		t.Fatalf("LoadLocation() error = %v", err)
+	}
+	now, err := time.Parse(time.RFC3339, value)
+	if err != nil {
+		t.Fatalf("parse time: %v", err)
+	}
+	resolved, err := report.DefaultRegistry().Resolve(report.NearTerm, report.ResolveRequest{
+		Now:      now,
+		Location: location,
+	})
+	if err != nil {
+		t.Fatalf("Resolve() error = %v", err)
+	}
+	return resolved
+}
+
 func stateBriefingMetadata(resolved report.Resolved) briefing.Metadata {
 	return briefing.Metadata{
 		RunID:       resolved.Metadata().RunID,