Parse KVM domain metadata by local name: libvirt returns it without a namespace

Run 3 on the real host got past Create and failed in Get: libvirt 11.6
selects the <instance> element by our URI in DomainGetMetadata but hands
it back with no namespace declaration, and the parser required the URI
on the element. The lookup already guarantees the namespace, so match on
the local name only. The fake now strips the declaration the way libvirt
does, and a new test pins the bare form. Execution log updated.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/provider/kvm/metadata_test.go

@@ -45,6 +45,21 @@ func TestParseInstanceMetadata_libvirtPrefixedForm(t *testing.T) {
 	}
 }
 
+func TestParseInstanceMetadata_libvirtBareForm(t *testing.T) {
+	t.Parallel()
+	// What libvirt 11.6 actually returns from DomainGetMetadata: the element
+	// selected by our URI, serialised without any namespace declaration.
+	in := `<instance><managed>true</managed><uid>uid-3</uid>` +
+		`<createdAt>2026-09-10T07:30:00Z</createdAt></instance>`
+	m, err := parseInstanceMetadata(in)
+	if err != nil {
+		t.Fatalf("parseInstanceMetadata() error = %v", err)
+	}
+	if !m.managed() || m.UID != "uid-3" || m.createdAt().Minute() != 30 {
+		t.Errorf("parsed = %+v", m)
+	}
+}
+
 func TestParseInstanceMetadata_notManaged(t *testing.T) {
 	t.Parallel()
 	tests := []struct {