DOCs Chore - Add module docstring for better documentation to `tests/test_hear_cleanup.py`

[reactive-firewall]

Add module docstring for better documentation to tests/test_hear_cleanup.py

+"""
+Test module for verifying cleanup behavior of the multicast hearing mechanism.
+
+This module contains test suites that verify proper resource cleanup and process
+termination when the multicast hearing process receives shutdown signals.
+"""

[reactive-firewall]

also consider:

-    QUICK_JOIN_TIMEOUT = 1  # Quick check for process termination
-    ERROR_JOIN_TIMEOUT = 3  # Timeout when handling errors
-    FINAL_JOIN_TIMEOUT = 15  # Final wait for process cleanup
+    # Maximum time (in seconds) to wait for initial process termination
+    QUICK_JOIN_TIMEOUT = 1
+
+    # Maximum time (in seconds) to wait when handling cleanup during errors
+    ERROR_JOIN_TIMEOUT = 3
+
+    # Maximum time (in seconds) to wait for final process cleanup
+    FINAL_JOIN_TIMEOUT = 15

[reactive-firewall]

Also consider:

 class HearCleanupTestSuite(context.BasicUsageTestSuite):
+    # Standard multicast group address for testing
+    TEST_MULTICAST_GROUP = "224.0.0.1"
+
     """
     Test suite for verifying the cleanup behavior of the multicast hearing mechanism.