fix(parse): emit broader tested_by candidates

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: tae2089

internal/parse/treesitter/walker.go

@@ -583,14 +583,10 @@ func (w *Walker) resolveTestedBy(nodes []model.Node, edges *[]model.Edge, filePa
 	}
 
 	testNodes := make(map[string]model.Node)
-	nonTestNames := make(map[string]bool)
 
 	for _, n := range nodes {
-		switch n.Kind {
-		case model.NodeKindTest:
+		if n.Kind == model.NodeKindTest {
 			testNodes[n.QualifiedName] = n
-		case model.NodeKindFunction:
-			nonTestNames[n.Name] = true
 		}
 	}
 
@@ -608,10 +604,6 @@ func (w *Walker) resolveTestedBy(nodes []model.Node, edges *[]model.Edge, filePa
 		calleeParts := strings.Split(callee, ".")
 		bareCallee := calleeParts[len(calleeParts)-1]
 
-		if !nonTestNames[bareCallee] {
-			continue
-		}
-
 		for testQName, testNode := range testNodes {
 			if e.Line >= testNode.StartLine && e.Line <= testNode.EndLine {
 				*edges = append(*edges, model.Edge{

internal/parse/treesitter/walker_test.go

@@ -902,6 +902,26 @@ func TestAdd(t *testing.T) {
 	}
 }
 
+func TestParseGo_TestedByEmitsCandidateForCrossFileProductionCall(t *testing.T) {
+	src := `package main
+
+func TestAdd(t *testing.T) {
+	Add(1, 2)
+}
+`
+	w := NewWalker(GoSpec)
+	_, edges, err := w.Parse("main_test.go", []byte(src))
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	for _, e := range filterEdgesByKind(edges, model.EdgeKindTestedBy) {
+		if containsSubstring(e.Fingerprint, "Add") && containsSubstring(e.Fingerprint, "TestAdd") {
+			return
+		}
+	}
+	t.Fatalf("expected TESTED_BY candidate for Add call in TestAdd, got %+v", edges)
+}
+
 // --- Phase 12.1: JavaScript ---
 
 func TestParseJS_Function(t *testing.T) {