feat(i18n): inject user language into AI agent system prompts

- Add _language_instruction() to deep_agent.py, reads language from core memory
- Append language directive to all 4 run_* functions (task/project/checkpoint/note)
- Minor fixes: alembic env, route imports, test cleanup

tests/test_agent_runner.py

@@ -28,7 +28,6 @@ from datetime import datetime, timezone
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
-import pytest_asyncio
 
 from app.core.agent_runner import (
     _extract_items_from_content,
@@ -597,7 +596,7 @@ async def test_run_cloud_agent_provider_fetch_error():
 @pytest.mark.asyncio
 async def test_run_cloud_agent_refreshed_token_persisted():
     """When the provider refreshes its token, the new ciphertext is written to DB."""
-    from app.integrations import EmailMessage, encrypt_token
+    from app.integrations import encrypt_token
     from cryptography.fernet import Fernet as _Fernet
 
     fernet_key = _Fernet.generate_key().decode()

tests/test_agent_runner_v2.py

@@ -40,7 +40,6 @@ from app.core.agent_runner import (
     _format_projects,
     _get_extraction_rules,
     _get_no_match_behavior,
-    _is_overdue,
     run_local_agent,
 )
 from app.core.device_manager import DeviceConnectionManager

tests/test_agent_setup.py

@@ -21,7 +21,6 @@ import time
 import uuid
 from unittest.mock import AsyncMock, patch
 
-import pytest
 from fastapi.testclient import TestClient
 from sqlalchemy.ext.asyncio import AsyncSession
 

tests/test_device_ws.py

@@ -18,13 +18,12 @@ from datetime import datetime, timezone
 from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
-import pytest_asyncio
 
-from app.core.device_manager import DeviceConnection, DeviceConnectionManager
+from app.core.device_manager import DeviceConnectionManager
 from app.db import get_session
 from app.main import app
 from app.models import AgentRunLog
-from tests.conftest import TEST_USER_IDS, auth_header, make_jwt
+from tests.conftest import TEST_USER_IDS, make_jwt
 
 # ---------------------------------------------------------------------------
 # Helpers

tests/test_integrations.py

@@ -40,11 +40,9 @@ Coverage:
 
 from __future__ import annotations
 
-import asyncio
 import json
-import uuid
 from datetime import datetime, timezone
-from unittest.mock import AsyncMock, MagicMock, Mock, PropertyMock, patch
+from unittest.mock import AsyncMock, MagicMock, PropertyMock, patch
 
 import pytest
 

tests/test_memory_middleware.py

@@ -19,7 +19,7 @@ import pytest_asyncio
 from cryptography.fernet import Fernet
 from sqlalchemy import select
 
-from app.core.memory_middleware import MemoryMiddleware, _PROACTIVE_CONFIDENCE_THRESHOLD
+from app.core.memory_middleware import MemoryMiddleware
 from app.db import get_session
 from app.main import app
 from app.models import (

tests/test_memory_models.py

@@ -7,10 +7,9 @@ column is stored as JSON in tests (SQLite-compatible).
 from __future__ import annotations
 
 import uuid
-from datetime import datetime, timezone
+from datetime import datetime
 
 import pytest
-import pytest_asyncio
 from cryptography.fernet import Fernet
 from sqlalchemy import select
 

tests/test_preprocessors.py

@@ -12,7 +12,6 @@ from __future__ import annotations
 import re
 from pathlib import Path
 
-import pytest
 import yaml
 
 from app.core.preprocessors import detect_content_type, preprocess