fix(apex): emit extends edges for interface multiple inheritance

interface X extends A, B captured the parent list in iface_re group 2 but the handler only read group 1, so no inheritance edge was emitted. Split the parent list and emit one extends edge per parent (mirroring the class branch).

graphify/extract.py

@@ -6297,6 +6297,16 @@ def extract_apex(path: Path) -> dict:
             add_node(iface_nid, iface_name, lineno)
             add_edge(file_nid if current_class_nid is None else current_class_nid,
                      iface_nid, "contains", lineno)
+            if im.group(2):
+                for parent in im.group(2).split(","):
+                    parent = parent.strip()
+                    if parent:
+                        parent_nid = _make_id(stem, parent)
+                        if parent_nid not in seen_ids:
+                            parent_nid = _make_id(parent)
+                        if parent_nid not in seen_ids:
+                            add_node(parent_nid, parent, lineno)
+                        add_edge(iface_nid, parent_nid, "extends", lineno, confidence="INFERRED")
             pending_annotations = []
             continue
 

tests/test_languages.py

@@ -2627,6 +2627,16 @@ def test_apex_interface_extraction():
     labels = _labels(r)
     assert "Notifiable" in labels
 
+def test_apex_interface_extends(tmp_path):
+    source = tmp_path / "PaymentProcessor.cls"
+    source.write_text(
+        "public interface PaymentProcessor extends Processor, Auditable { void process(); }\n"
+    )
+    result = extract_apex(source)
+    inheritance = _edge_labels(result, "extends") | _edge_labels(result, "implements")
+    assert ("PaymentProcessor", "Processor") in inheritance
+    assert ("PaymentProcessor", "Auditable") in inheritance
+
 def test_apex_method_extraction():
     r = extract_apex(FIXTURES / "sample.cls")
     labels = _labels(r)