feat(mma): Add topological sorting to TrackDAG with cycle detection

dag_engine.py

@@ -50,3 +50,29 @@ class TrackDAG:
                 if is_cyclic(ticket.id):
                     return True
         return False
+
+    def topological_sort(self) -> List[str]:
+        """
+        Returns a list of ticket IDs in topological order.
+        Raises ValueError if a cycle is detected.
+        """
+        if self.has_cycle():
+            raise ValueError("Dependency cycle detected")
+
+        visited = set()
+        stack = []
+
+        def visit(ticket_id):
+            if ticket_id in visited:
+                return
+            visited.add(ticket_id)
+            ticket = self.ticket_map.get(ticket_id)
+            if ticket:
+                for dep_id in ticket.depends_on:
+                    visit(dep_id)
+            stack.append(ticket_id)
+
+        for ticket in self.tickets:
+            visit(ticket.id)
+
+        return stack