fix(arch-a2): deactivation cleanup - container services, search provider, hook deregistration, notification sync, task state, activation order

app/plugins/builtins/self_improvement/services.py

@@ -579,29 +579,30 @@ async def request_approval(
     proposal.approval_request_id = req.id
     await db.flush()
 
-    # Post to Communication via KommunikationContract
+    # Post to Communication via KommunikationContract (ARCH-013: contract
+    # only — no direct plugin imports; skip cleanly when contract is absent)
     try:
         from app.plugins.builtins.contracts import get_contract
-        # Find or create a system conversation for improvement proposals
         _komm = get_contract("kommunikation")
         if not _komm or not hasattr(_komm, "create_plugin_room"):
-            from app.plugins.builtins.kommunikation.services import create_plugin_room
-        room = await create_plugin_room(
-            db=db, tenant_id=tenant_id, user_id=requested_by,
-            plugin_name="self_improvement", title="Improvement Proposals",
-            participant_type="system",
-        )
-        conversation_id = room.get("conversation_id") if isinstance(room, dict) else None
-        if not conversation_id and hasattr(room, "id"):
-            conversation_id = room.id
-        if conversation_id:
-            await KommunikationContract.send_message(
-                db=db,
-                tenant_id=tenant_id,
-                conversation_id=conversation_id,
-                sender_id=requested_by,
-                sender_type="system",
-                content=f"Improvement Proposal: {proposal.title}",
+            logger.warning("kommunikation contract unavailable - skipping proposal notification")
+        else:
+            room = await _komm.create_plugin_room(
+                db=db, tenant_id=tenant_id, user_id=requested_by,
+                plugin_name="self_improvement", title="Improvement Proposals",
+                participant_type="system",
+            )
+            conversation_id = room.get("conversation_id") if isinstance(room, dict) else None
+            if not conversation_id and hasattr(room, "id"):
+                conversation_id = room.id
+            if conversation_id:
+                await _komm.send_message(
+                    db=db,
+                    tenant_id=tenant_id,
+                    conversation_id=conversation_id,
+                    sender_id=requested_by,
+                    sender_type="system",
+                    content=f"Improvement Proposal: {proposal.title}",
                 blocks=[
                     {
                         "type": "action_card",