fix(groovy): emit inherits/implements edges for extends/implements

tree-sitter-groovy exposes inheritance via the same `superclass` and
`interfaces`/`type_list` fields as tree-sitter-java, but the inheritance-
emitting block in `_extract_generic` was gated on
`ts_module == "tree_sitter_java"`. Groovy was the only class-based JVM
language in the file with no inheritance handler, so every Groovy
`extends`/`implements` was silently dropped (contains/methods/imports/calls
were unaffected).

Widen the gate to include `tree_sitter_groovy`; the existing
`_emit_java_parent_type` path handles the identical node shapes verbatim.
Adds a base class + interface to the Groovy fixture and two regression
tests (extends -> inherits, implements -> implements).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

graphify/extract.py

@@ -3513,7 +3513,7 @@ def _extract_generic(
                                                  context="generic_arg", metadata=metadata)
 
             # Java-specific: extends (superclass) / implements (interfaces) / interface-extends
-            if config.ts_module == "tree_sitter_java":
+            if config.ts_module in ("tree_sitter_java", "tree_sitter_groovy"):
                 def _emit_java_parent(base_name: str, rel: str, at_line: int) -> None:
                     if not base_name:
                         return

tests/fixtures/sample.groovy

@@ -19,3 +19,17 @@ class SampleService {
         processor.reset()
     }
 }
+
+interface Resettable {
+    void reset()
+}
+
+class ExtendedService extends SampleService implements Resettable {
+    ExtendedService(Processor processor) {
+        super(processor)
+    }
+
+    void reset() {
+        // no-op
+    }
+}

tests/test_languages.py

@@ -2195,6 +2195,35 @@ def test_groovy_no_dangling_edges():
         assert e["source"] in node_ids
 
 
+def test_groovy_extends_edge():
+    """`class X extends Base` must emit an inherits edge.
+
+    tree-sitter-groovy exposes inheritance via the same `superclass` field as
+    tree-sitter-java, but the inheritance handler was gated to Java only, so
+    Groovy extends/implements were silently dropped.
+    """
+    r = extract_groovy(FIXTURES / "sample.groovy")
+    node_by_id = {n["id"]: n["label"] for n in r["nodes"]}
+    found = any(
+        "ExtendedService" in node_by_id.get(e["source"], "")
+        and "SampleService" in node_by_id.get(e["target"], "")
+        for e in r["edges"] if e["relation"] == "inherits"
+    )
+    assert found, "ExtendedService should have inherits edge to SampleService"
+
+
+def test_groovy_implements_edge():
+    """`class X implements Iface` must emit an implements edge."""
+    r = extract_groovy(FIXTURES / "sample.groovy")
+    node_by_id = {n["id"]: n["label"] for n in r["nodes"]}
+    found = any(
+        "ExtendedService" in node_by_id.get(e["source"], "")
+        and "Resettable" in node_by_id.get(e["target"], "")
+        for e in r["edges"] if e["relation"] == "implements"
+    )
+    assert found, "ExtendedService should have implements edge to Resettable"
+
+
 def test_groovy_spock_finds_class():
     r = extract_groovy(FIXTURES / "sample_spock.groovy")
     assert any("SampleSpec" in l for l in _labels(r))