R-106 + R-109: the DR recipe records the resolved namespace and names the backup target (v0.118.0)

Both defects were live on both demo boxes: the recipe said namespace "root" while
storage.cfg said demo-felhom/demo-hp, and it never named which of two content=backup
dir storages holds the local archives.

R-106: the namespace came from the listed snapshot, but PBS omits `ns` per item once
the list is namespace-scoped, so it was always empty and normalised to "root". It now
resolves from the pbs STORAGE (storage.cfg's `namespace`) — the same field vzdump makes
PVE read, so the recipe cannot disagree with the backup.

R-109: backup_target resolves from the primary tier of cfg.Backup.BackupTiers(), the
function the scheduler consults, and carries the mountpoint that separates /mnt/hdd_1
from /var/lib/vz. The resolver reports the tier IN EFFECT (daemon-start config), not
agent.json on disk — a target move rewrites the file and deliberately does not restart.

Unresolvable is recorded as unresolvable: resolved|unknown plus a distinct reason,
never a default, an empty string, or a placeholder.

Needs hub v0.83.0 — AssembleDRRecipe allow-lists top-level keys, so backup_target
would otherwise be stored intact and dropped before any operator saw it.

9 tests, 4 red-proofs (each mutation asserted to have landed). Suite rc=0, 29 ok.

internal/pbs/live_reporter_test.go

@@ -55,7 +55,8 @@ func TestLiveReporter_CoordPresentWithoutPriorVerify(t *testing.T) {
 
 	// The whole point: a recipe built from the live read carries the pbs coord.
 	h := hub.BuildDRRecipeHostHalf(nil,
-		[]hub.StorageTarget{{Name: "felhom-pbs", Type: hub.StorageTypePBS, Content: "backup"}}, got)
+		[]hub.StorageTarget{{Name: "felhom-pbs", Type: hub.StorageTypePBS, Content: "backup"}}, got,
+		hub.ConfiguredBackupTarget{StorageID: "felhom-pbs", Known: true})
 	if h.PBS == nil {
 		t.Fatal("pbs coord absent despite a reachable PBS — the gap this fixes")
 	}
@@ -67,7 +68,8 @@ func TestLiveReporter_CoordPresentWithoutPriorVerify(t *testing.T) {
 	bare := NewSnapshotStore()
 	h2 := hub.BuildDRRecipeHostHalf(nil,
 		[]hub.StorageTarget{{Name: "felhom-pbs", Type: hub.StorageTypePBS, Content: "backup"}},
-		bare.PBSSnapshots(context.Background()))
+		bare.PBSSnapshots(context.Background()),
+		hub.ConfiguredBackupTarget{StorageID: "felhom-pbs", Known: true})
 	if h2.PBS != nil {
 		t.Fatal("companion sanity: the bare store should yield NO pbs coord (proves the live read is load-bearing)")
 	}