Precompute canonical paths before sorting

internal/engine/projection_test.go

@@ -357,6 +357,21 @@ func TestCompareDocumentTreesTracksSemanticChanges(t *testing.T) {
 	}
 }
 
+func TestCompareConfigurationValuesSortEscapedPointers(t *testing.T) {
+	before := parseCompositionDocument(t, "before", `values: {z: old, 'a/b': old, 'a~b': old, nested: {x: old}}`)
+	after := parseCompositionDocument(t, "after", `values: {z: new, 'a/b': new, 'a~b': new, nested: {x: new}}`)
+	deltas := compareConfigurationValues(before, after)
+	want := []string{"/values/a~0b", "/values/a~1b", "/values/nested/x", "/values/z"}
+	if len(deltas) != len(want) {
+		t.Fatalf("deltas = %#v", deltas)
+	}
+	for i, delta := range deltas {
+		if got := delta.path.String(); got != want[i] {
+			t.Fatalf("delta[%d] path = %q, want %q", i, got, want[i])
+		}
+	}
+}
+
 func mustSchemaFor[T any](t *testing.T) *schemaDescriptor {
 	t.Helper()
 	schema, issue := testBuildSchema(reflect.TypeFor[T]())