fix(#148): Fix linting violations in quality orchestrator tests

Fixed code review findings:
- Removed unused imports (AsyncMock, MagicMock)
- Fixed line length violation in test_forced_continuation.py

All 15 tests still passing after fixes.

apps/coordinator/tests/test_forced_continuation.py

@@ -65,7 +65,10 @@ class TestForcedContinuationService:
                     message="Lint gate failed: Linting issues detected",
                     details={
                         "return_code": 1,
-                        "stderr": "src/main.py:10: E501 line too long\nsrc/models.py:5: F401 unused import",
+                        "stderr": (
+                            "src/main.py:10: E501 line too long\n"
+                            "src/models.py:5: F401 unused import"
+                        ),
                     },
                 ),
                 "test": GateResult(passed=True, message="Test passed", details={}),

apps/coordinator/tests/test_quality_orchestrator.py

@@ -1,7 +1,7 @@
 """Tests for QualityOrchestrator service."""
 
 import asyncio
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import patch
 
 import pytest