refactor(block-h): resolve CommConversation hardcoding via kommunikation contract

app/workflows/engine.py

@@ -92,22 +92,16 @@ class WorkflowEngine:
             # Post workflow completion to Communication (G-WORK)
             try:
                 from app.plugins.builtins.contracts import get_contract_registry
-                from app.plugins.builtins.kommunikation.models import CommConversation
-                from sqlalchemy import select as sa_select
                 komm = get_contract_registry().get("kommunikation")
                 if komm and instance.initiated_by:
                     room_title = f"Workflow: {workflow.name if hasattr(workflow, 'name') else str(instance.workflow_id)}"
-                    existing = await self.db.execute(
-                        sa_select(CommConversation).where(
-                            CommConversation.tenant_id == self.tenant_id,
-                            CommConversation.title == room_title,
-                            CommConversation.is_locked.is_(True),
-                            CommConversation.locked_by == "workflow",
-                            CommConversation.deleted_at.is_(None),
-                        )
+                    conv_id = await komm.find_locked_room_id(
+                        db=self.db,
+                        tenant_id=self.tenant_id,
+                        plugin_name="workflow",
+                        title=room_title,
                     )
-                    conv = existing.scalar_one_or_none()
-                    if not conv:
+                    if not conv_id:
                         room = await komm.create_plugin_room(
                             db=self.db,
                             tenant_id=self.tenant_id,
@@ -117,8 +111,6 @@ class WorkflowEngine:
                             participant_type="workflow",
                         )
                         conv_id = uuid.UUID(room["conversation_id"])
-                    else:
-                        conv_id = conv.id
                     await komm.send_message(
                         db=self.db,
                         tenant_id=self.tenant_id,