feat(hierarchy): descPrefix selector for Compose testTag + UUID suffixes

internal/hierarchy/hierarchy.go

@@ -3,9 +3,10 @@
 //
 // Selector grammar (v0.1):
 //
-//	id:<suffix>     — match resource-id ending with ":id/<suffix>" or equal to <suffix>
-//	text:<value>    — exact match on the node's text
-//	desc:<value>    — exact match on the node's content-desc
+//	id:<suffix>            — match resource-id ending with ":id/<suffix>" or equal to <suffix>
+//	text:<value>           — exact match on the node's text
+//	desc:<value>           — exact match on the node's content-desc
+//	descPrefix:<prefix>    — startsWith match on the node's content-desc (e.g. Compose testTag + UUID)
 package hierarchy
 
 import (
@@ -133,6 +134,8 @@ func match(element *Element, kind, value string) bool {
 		return element.Text == value
 	case "desc":
 		return element.Description == value
+	case "descPrefix":
+		return strings.HasPrefix(element.Description, value)
 	default:
 		return false
 	}

internal/hierarchy/hierarchy_test.go

@@ -73,3 +73,16 @@ func TestUnknownSelector(t *testing.T) {
 		t.Fatal("unknown kind should not match")
 	}
 }
+
+func TestDescPrefix(t *testing.T) {
+	xml := `<hierarchy>
+		<node content-desc="customer_row_abc-123" bounds="[0,0][100,100]"/>
+		<node content-desc="customer_row_def-456" bounds="[0,100][100,200]"/>
+		<node content-desc="supplier_row_xyz" bounds="[0,200][100,300]"/>
+	</hierarchy>`
+	tree, _ := Parse(xml)
+	rows := tree.FindAll("descPrefix:customer_row_")
+	if len(rows) != 2 {
+		t.Fatalf("want 2 customer rows, got %d", len(rows))
+	}
+}