fix(analyzer): path-qualify SERVICE node IDs to break PK collisions

ServiceDetector emitted node IDs as `"service:" + name`. When a
codebase contains two modules in different directories sharing a
service name (e.g. `frontend/widgets/checkbox/` and
`backend/components/checkbox/` both with `name = "checkbox"` in
pyproject.toml) the IDs collided. Kuzu's BulkLoadNodes COPY aborts
the whole batch on duplicate PK, so enrich exited non-zero on real
polyglot trees (~/projects/, polyglot-bench).

Switch IDs to `service:<dir>:<name>`, falling back to `.` for the
root module so the format mirrors the existing FilePath stamping.
Edge IDs flip from `edge:service:<label>:contains:...` to
`edge:<sn.ID>:contains:...` for consistency — sn.ID is now the
path-qualified identifier, sn.Label remains the friendly display
name.

Adds TestServiceDetectorPathQualifiedIDsBreakCollision which fails
on main and passes after this patch.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: aksOps

go/internal/analyzer/service_detector.go

@@ -165,7 +165,7 @@ func (sd *ServiceDetector) Detect(nodes []*model.CodeNode, edges []*model.CodeEd
 		info := modules[dir]
 		name := sd.extractServiceName(dir, info, projectDir, projectRoot)
 		sn := &model.CodeNode{
-			ID:          "service:" + name,
+			ID:          serviceID(dir, name),
 			Kind:        model.NodeService,
 			Label:       name,
 			FilePath:    ifBlank(dir, "."),
@@ -213,7 +213,7 @@ func (sd *ServiceDetector) Detect(nodes []*model.CodeNode, edges []*model.CodeEd
 		}
 		n.Properties["service"] = sn.Label
 		newEdges = append(newEdges, &model.CodeEdge{
-			ID:         fmt.Sprintf("edge:service:%s:contains:%s", sn.Label, n.ID),
+			ID:         fmt.Sprintf("edge:%s:contains:%s", sn.ID, n.ID),
 			Kind:       model.EdgeContains,
 			SourceID:   sn.ID,
 			TargetID:   n.ID,
@@ -441,3 +441,12 @@ func matchFirst(re *regexp.Regexp, s string) string {
 	}
 	return strings.TrimSpace(m[1])
 }
+
+// serviceID builds a path-qualified service node ID. Two modules that share a
+// service name in different directories must not collide on the same primary
+// key — Kuzu's COPY FROM aborts the whole batch when a duplicate PK appears.
+// Root module (empty dir) uses "." so the format stays consistent with the
+// FilePath stamping at line 171.
+func serviceID(dir, name string) string {
+	return "service:" + ifBlank(dir, ".") + ":" + name
+}

go/internal/analyzer/service_detector_test.go

@@ -64,14 +64,60 @@ func TestServiceDetectorTwoModules(t *testing.T) {
 	if mavenSvc.Layer != model.LayerBackend {
 		t.Fatalf("maven svc layer = %v, want backend", mavenSvc.Layer)
 	}
-	if mavenSvc.ID != "service:my-java-app" {
-		t.Fatalf("maven svc id = %q, want service:my-java-app", mavenSvc.ID)
+	if mavenSvc.ID != "service:.:my-java-app" {
+		t.Fatalf("maven svc id = %q, want service:.:my-java-app", mavenSvc.ID)
 	}
 
 	npmSvc := serviceByLabel(t, r.Nodes, "api-server")
 	if got := npmSvc.Properties["build_tool"]; got != "npm" {
 		t.Fatalf("npm svc build_tool = %v, want npm", got)
 	}
+	if npmSvc.ID != "service:api:api-server" {
+		t.Fatalf("npm svc id = %q, want service:api:api-server", npmSvc.ID)
+	}
+}
+
+// TestServiceDetectorPathQualifiedIDsBreakCollision: two modules in different
+// directories that share the same service name MUST get distinct IDs so Kuzu's
+// BulkLoadNodes COPY doesn't abort on duplicate primary key. Pre-fix this
+// emitted "service:checkbox" twice and the whole batch was rejected.
+func TestServiceDetectorPathQualifiedIDsBreakCollision(t *testing.T) {
+	root := t.TempDir()
+	// Two distinct Python modules in different folders, both named "checkbox".
+	writeFile(t, root, "frontend/widgets/checkbox/pyproject.toml", `[project]
+name = "checkbox"
+`)
+	writeFile(t, root, "backend/components/checkbox/pyproject.toml", `[project]
+name = "checkbox"
+`)
+
+	d := &ServiceDetector{}
+	r := d.Detect(nil, nil, "p", root)
+
+	if len(r.Nodes) != 2 {
+		t.Fatalf("want 2 service nodes, got %d", len(r.Nodes))
+	}
+
+	ids := map[string]bool{}
+	for _, n := range r.Nodes {
+		if n.Label != "checkbox" {
+			t.Errorf("want both labels = checkbox, got %q", n.Label)
+		}
+		if ids[n.ID] {
+			t.Fatalf("duplicate service ID %q — Kuzu BulkLoad would abort here", n.ID)
+		}
+		ids[n.ID] = true
+	}
+
+	want := map[string]bool{
+		"service:frontend/widgets/checkbox:checkbox": true,
+		"service:backend/components/checkbox:checkbox": true,
+	}
+	for id := range want {
+		if !ids[id] {
+			t.Errorf("missing expected ID %q. got: %v", id, ids)
+		}
+	}
 }
 
 // TestServiceDetectorDirectoryFallback: build file with no extractable name →