Add port release delays in test teardown to prevent race conditions

The tests were failing on CI due to ports remaining in TIME_WAIT state.
Adding a 0.2 second delay after stopping servers/partners allows the
OS to fully release the port before the next test starts.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: gijzelaerr

tests/test_partner.py

@@ -1,4 +1,5 @@
 import logging
+import time
 
 import pytest
 import unittest as unittest
@@ -21,6 +22,7 @@ def setUp(self) -> None:
     def tearDown(self) -> None:
         self.partner.stop()
         self.partner.destroy()
+        time.sleep(0.2)  # Give OS time to release the port
 
     def test_as_b_send(self) -> None:
         self.partner.as_b_send()

tests/test_server.py

@@ -1,5 +1,6 @@
 from ctypes import c_char
 import logging
+import time
 
 import pytest
 import unittest
@@ -21,6 +22,7 @@ def setUp(self) -> None:
     def tearDown(self) -> None:
         self.server.stop()
         self.server.destroy()
+        time.sleep(0.2)  # Give OS time to release the port
 
     def test_register_area(self) -> None:
         db1_type = c_char * 1024