Add delgd validation test for py_func and lua_func

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

test/validation/items/lua_func/lua_func.lua

@@ -41,4 +41,12 @@ function module.get_context_value()
     return tm.gd("_lua_ctx_test_value")
 end
 
+function module.test_delgd()
+    tm.setgd("_lua_delgd_test", 42)
+    assert(tm.gd("_lua_delgd_test") == 42)
+    tm.delgd("_lua_delgd_test")
+    assert(tm.gd("_lua_delgd_test") == nil)
+    return 0
+end
+
 return module

test/validation/items/lua_func/test.tum

@@ -180,6 +180,12 @@
                     func_name: tuple_return
                     param: [ 0, "OK" ]
 
+- lua_func:
+    name: delgd test
+    key: $(test)_PASS
+    file: $(test_path)$(psep)lua_func.lua
+    func_name: test_delgd
+
 - group:
     name: context_id tests
     steps: