feat(milestones): add POST /api/milestones endpoint and resolve collapsible_if warnings (TD-fc685b13-d9c2-4a57-ac4d-5228a71a2ec0)

server/src/handlers/tasks.rs

@@ -484,6 +484,9 @@ impl McpTool for MilestonesHandler {
                             }
                             if let Some(task_ids) = &req.task_ids {
                                 m.task_ids = task_ids.clone();
+                            if let Some(deliverables) = &req.deliverables {
+                                m.deliverables = deliverables.clone();
+                            }
                             }
                             found = true;
                             break;