Initial commit: breakpilot-lehrer - Lehrer KI Platform

Services: Admin-Lehrer, Backend-Lehrer, Studio v2, Website,
Klausur-Service, School-Service, Voice-Service, Geo-Service,
BreakPilot Drive, Agent-Core

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

agent-core/sessions/__init__.py

@@ -0,0 +1,25 @@
+"""
+Session Management for Breakpilot Agents
+
+Provides:
+- AgentSession: Individual agent session with context and checkpoints
+- SessionManager: Create, retrieve, and manage agent sessions
+- HeartbeatMonitor: Monitor agent liveness
+- SessionState: Session state enumeration
+"""
+
+from agent_core.sessions.session_manager import (
+    AgentSession,
+    SessionManager,
+    SessionState,
+)
+from agent_core.sessions.heartbeat import HeartbeatMonitor
+from agent_core.sessions.checkpoint import CheckpointManager
+
+__all__ = [
+    "AgentSession",
+    "SessionManager",
+    "SessionState",
+    "HeartbeatMonitor",
+    "CheckpointManager",
+]