fix: move suppress(ClosedResourceError) inside runner.shutdown() per review

Move the ClosedResourceError suppression from the two call sites in
worker/main.py into RunnerSupervisor.shutdown() itself, so each
close/send on already-closed channels is individually guarded.

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

src/exo/download/coordinator.py

@@ -338,7 +338,17 @@ class DownloadCoordinator:
                             ),
                         )
                     elif progress.status in ["in_progress", "not_started"]:
-                        if progress.downloaded_bytes_this_session.in_bytes == 0:
+                        if (
+                            progress.downloaded_bytes.in_bytes
+                            >= progress.total_bytes.in_bytes
+                            > 0
+                        ):
+                            status = DownloadCompleted(
+                                node_id=self.node_id,
+                                shard_metadata=progress.shard,
+                                total_bytes=progress.total_bytes,
+                            )
+                        elif progress.downloaded_bytes_this_session.in_bytes == 0:
                             status = DownloadPending(
                                 node_id=self.node_id,
                                 shard_metadata=progress.shard,

src/exo/main.py

@@ -258,7 +258,7 @@ def main():
     target = min(max(soft, 65535), hard)
     resource.setrlimit(resource.RLIMIT_NOFILE, (target, hard))
 
-    mp.set_start_method("spawn")
+    mp.set_start_method("spawn", force=True)
     # TODO: Refactor the current verbosity system
     logger_setup(EXO_LOG, args.verbosity)
     logger.info("Starting EXO")

src/exo/worker/runner/runner_supervisor.py

@@ -98,11 +98,16 @@ class RunnerSupervisor:
 
     def shutdown(self):
         logger.info("Runner supervisor shutting down")
-        self._ev_recv.close()
-        self._task_sender.close()
-        self._event_sender.close()
-        self._cancel_sender.send(TaskId("CANCEL_CURRENT_TASK"))
-        self._cancel_sender.close()
+        with contextlib.suppress(ClosedResourceError):
+            self._ev_recv.close()
+        with contextlib.suppress(ClosedResourceError):
+            self._task_sender.close()
+        with contextlib.suppress(ClosedResourceError):
+            self._event_sender.close()
+        with contextlib.suppress(ClosedResourceError):
+            self._cancel_sender.send(TaskId("CANCEL_CURRENT_TASK"))
+        with contextlib.suppress(ClosedResourceError):
+            self._cancel_sender.close()
         self.runner_process.join(5)
         if not self.runner_process.is_alive():
             logger.info("Runner process succesfully terminated")