Harden detached worker module startup

src/docforge/_projection_worker_main.py

@@ -0,0 +1,8 @@
+"""Private module entry point for the detached projection worker."""
+
+from __future__ import annotations
+
+from .projection_worker import main
+
+if __name__ == "__main__":
+    raise SystemExit(main())

src/docforge/projection_worker.py

@@ -201,7 +201,7 @@ def _invoke_worker(request: bytes) -> subprocess.CompletedProcess[bytes]:
             "PYTHONUTF8": "1",
         }
     )
-    command = [sys.executable, "-I", "-m", "docforge.projection_worker"]
+    command = [sys.executable, "-I", "-m", "docforge._projection_worker_main"]
     with tempfile.TemporaryFile() as output:
         completed = subprocess.run(
             command,

tests/test_projection_worker.py

@@ -118,7 +118,7 @@ class ProjectionWorkerTests(unittest.TestCase):
         command = launched.call_args.args[0]
         options = launched.call_args.kwargs
         self.assertEqual(
-            [sys.executable, "-I", "-m", "docforge.projection_worker"],
+            [sys.executable, "-I", "-m", "docforge._projection_worker_main"],
             command,
         )
         self.assertIs(options["shell"], False)
@@ -372,7 +372,7 @@ class ProjectionWorkerTests(unittest.TestCase):
         for request in requests:
             with self.subTest(length=len(request)):
                 completed = subprocess.run(
-                    [sys.executable, "-m", "docforge.projection_worker"],
+                    [sys.executable, "-I", "-m", "docforge._projection_worker_main"],
                     cwd=ROOT,
                     input=request,
                     capture_output=True,
@@ -381,6 +381,7 @@ class ProjectionWorkerTests(unittest.TestCase):
                 )
                 self.assertEqual(2, completed.returncode)
                 self.assertEqual(b"", completed.stdout)
+                self.assertEqual(b"", completed.stderr)
 
 
 if __name__ == "__main__":