fix: Restore all files lost during destructive rebase

A previous `git pull --rebase origin main` dropped 177 local commits,
losing 3400+ files across admin-v2, backend, studio-v2, website,
klausur-service, and many other services. The partial restore attempt
(660295e2) only recovered some files.

This commit restores all missing files from pre-rebase ref 98933f5e
while preserving post-rebase additions (night-scheduler, night-mode UI,
NightModeWidget dashboard integration).

Restored features include:
- AI Module Sidebar (FAB), OCR Labeling, OCR Compare
- GPU Dashboard, RAG Pipeline, Magic Help
- Klausur-Korrektur (8 files), Abitur-Archiv (5+ files)
- Companion, Zeugnisse-Crawler, Screen Flow
- Full backend, studio-v2, website, klausur-service
- All compliance SDKs, agent-core, voice-service
- CI/CD configs, documentation, scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

agent-core/tests/conftest.py

@@ -0,0 +1,57 @@
+"""
+Pytest configuration and fixtures for agent-core tests
+"""
+
+import pytest
+import asyncio
+import sys
+from pathlib import Path
+
+# Add agent-core to path
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+
+@pytest.fixture(scope="session")
+def event_loop():
+    """Create an instance of the default event loop for each test case."""
+    loop = asyncio.get_event_loop_policy().new_event_loop()
+    yield loop
+    loop.close()
+
+
+@pytest.fixture
+def mock_redis():
+    """Mock Redis client for testing"""
+    from unittest.mock import AsyncMock, MagicMock
+
+    redis = AsyncMock()
+    redis.get = AsyncMock(return_value=None)
+    redis.set = AsyncMock(return_value=True)
+    redis.setex = AsyncMock(return_value=True)
+    redis.delete = AsyncMock(return_value=True)
+    redis.keys = AsyncMock(return_value=[])
+    redis.publish = AsyncMock(return_value=1)
+    redis.pubsub = MagicMock()
+
+    return redis
+
+
+@pytest.fixture
+def mock_db_pool():
+    """Mock PostgreSQL pool for testing"""
+    from unittest.mock import AsyncMock, MagicMock
+    from contextlib import asynccontextmanager
+
+    pool = AsyncMock()
+
+    @asynccontextmanager
+    async def acquire():
+        conn = AsyncMock()
+        conn.fetch = AsyncMock(return_value=[])
+        conn.fetchrow = AsyncMock(return_value=None)
+        conn.execute = AsyncMock(return_value="UPDATE 0")
+        yield conn
+
+    pool.acquire = acquire
+
+    return pool