Cover model request parse-boundary in AST helper usage guard

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

tests/test_ast_function_source_helper_usage.py

@@ -8,6 +8,7 @@
 AST_FUNCTION_SOURCE_GUARD_MODULES = (
     "tests/test_job_request_route_builder_internal_reuse.py",
     "tests/test_job_request_wrapper_internal_reuse.py",
+    "tests/test_model_request_function_parse_boundary.py",
     "tests/test_model_request_function_transport_boundary.py",
     "tests/test_model_request_wrapper_internal_reuse.py",
     "tests/test_request_wrapper_internal_reuse.py",