Remove dead worker_recv/2 code from py_nif.erl

Removed worker_recv/2 function that was declared in Erlang but had no
corresponding C NIF implementation.

Author: benoitc

CHANGELOG.md

@@ -37,6 +37,10 @@
   - Added NULL checks on all `enif_alloc_resource` and `enif_alloc_env` calls
 - **Dialyzer warnings** - Added `{suspended, ...}` return type to NIF specs for
   `worker_call`, `worker_eval`, and `resume_callback` functions
+- **Dead code removal** - Cleaned up unused code discovered during code review:
+  - Removed `execute_direct()` function in `py_exec.c` (duplicated inline logic)
+  - Removed unused `ref` field from `async_pending_t` struct in `py_nif.h`
+  - Removed `worker_recv/2` from `py_nif.erl` (declared but never implemented in C)
 
 ### Documentation
 

src/py_nif.erl

@@ -33,7 +33,6 @@
     worker_eval/4,
     worker_exec/2,
     worker_next/2,
-    worker_recv/2,
     import_module/2,
     get_attr/3,
     version/0,
@@ -175,12 +174,6 @@ worker_exec(_WorkerRef, _Code) ->
 worker_next(_WorkerRef, _GeneratorRef) ->
     ?NIF_STUB.
 
-%% @doc Wait for a message in the worker loop.
-%% Releases the GIL while waiting.
--spec worker_recv(reference(), timeout()) -> {ok, term()} | timeout | {error, term()}.
-worker_recv(_WorkerRef, _TimeoutMs) ->
-    ?NIF_STUB.
-
 %%% ============================================================================
 %%% Module Operations
 %%% ============================================================================