fix(dep-graph): use language-aware test filtering

Use lang_parser's language-specific test-file rules for supported source files
during dependency-graph build filtering, while preserving the legacy test-ish
filter for non-source files. This prevents valid non-Python sources such as Go
testdata fixtures or TypeScript test helper modules from being excluded before
parse-time filtering can see them.

Add regression coverage for Go testdata, non-Python helper source files,
language-specific test files, and legacy non-source test-ish exclusions.

Author: QingtaoLi1

CoderMind/scripts/rpg/dep_graph.py

@@ -93,7 +93,10 @@ def _exclude_irrelevant_for_build(file_id: str) -> bool:
     if path_obj.name.startswith("."):
         return False
 
-    if is_test_file(file_id):
+    if lang_parser.is_supported_source(file_id):
+        if lang_parser.is_test_file(file_id):
+            return False
+    elif is_test_file(file_id):
         return False
 
     return True

CoderMind/tests/test_dep_graph.py

@@ -239,6 +239,19 @@ def test_pyproject_excluded(self):
     def test_node_modules_excluded(self):
         assert _exclude_irrelevant_for_build("node_modules/package/index.js") is False
 
+    def test_go_testdata_source_included(self):
+        assert _exclude_irrelevant_for_build("pkg/testdata/fixtures.go") is True
+
+    def test_non_python_test_helper_source_included_when_language_rule_allows(self):
+        assert _exclude_irrelevant_for_build("src/test_helpers.ts") is True
+
+    def test_language_test_source_excluded(self):
+        assert _exclude_irrelevant_for_build("pkg/foo_test.go") is False
+        assert _exclude_irrelevant_for_build("src/client.test.ts") is False
+
+    def test_non_source_testish_file_keeps_legacy_exclusion(self):
+        assert _exclude_irrelevant_for_build("data/test_fixture.json") is False
+
 
 class TestExcludeIrrelevantForParse:
     def test_python_file_included(self):