fix: Resolve test isolation bug in pairing integration tests

Use temporary directories for each test to prevent state leakage
between test runs. Previously, all tests shared the default global
pairing store path, causing paired users to persist across tests.

- Add tempfile.mkdtemp() for isolated test directories
- Add teardown_method() to clean up temporary directories
- Each test now gets fresh pairing store, fixing false failures

Fixes test isolation issue where test_owner_approval_allows_future_messages
was affecting subsequent tests by persisting pairing state.

Author: praisonai-triage-agent[bot]

src/praisonai/tests/integration/bots/test_pairing_owner_dm.py

@@ -5,6 +5,8 @@
 """
 
 import pytest
+import tempfile
+import shutil
 from unittest.mock import AsyncMock, MagicMock
 from typing import Dict, List
 
@@ -56,7 +58,8 @@ class TestPairingOwnerDM:
     def setup_method(self):
         """Set up test environment."""
         self.adapter = StubBotAdapter()
-        self.pairing_store = PairingStore()
+        self._pairing_dir = tempfile.mkdtemp(prefix="test_pairing_")
+        self.pairing_store = PairingStore(store_dir=self._pairing_dir)
         self.config = BotConfig(
             unknown_user_policy="pair",
             owner_user_id="owner-123"
@@ -66,6 +69,10 @@ def setup_method(self):
             pairing_store=self.pairing_store,
             adapter=self.adapter
         )
+
+    def teardown_method(self):
+        """Clean up test environment."""
+        shutil.rmtree(self._pairing_dir, ignore_errors=True)
 
     def create_test_message(self, user_id: str = "new-user", user_name: str = "Alice") -> BotMessage:
         """Create a test message from an unknown user."""