fix: use event-driven renderer for build progress

command/up.ts

@@ -738,7 +738,7 @@ export async function runUp(
   };
   const workspacePath = `/workspaces/${encodeURIComponent(project)}`;
 
-  const taskCtx = await new Listr<UpContext>(
+  const taskCtx = await new Listr<UpContext, "default" | "simple">(
     [
       {
         title: "Read compose",
@@ -796,7 +796,7 @@ export async function runUp(
               cwd,
               {
                 progress: (message) => {
-                  task.output = message;
+                  if (task.output !== message) task.output = message;
                 },
                 service: (name) => {
                   let stream: ReturnType<ListrTaskWrapper<UpContext, any, any>["stdout"]> | undefined;
@@ -1071,7 +1071,13 @@ export async function runUp(
         },
       },
     ],
-    { rendererOptions: { collapseErrors: false } },
+    {
+      // Build progress can remain queued across many polls. The default TTY
+      // spinner redraws every child on every tick, which duplicates those
+      // frames in captured terminal output. Simple emits only task events.
+      renderer: build ? "simple" : "default",
+      rendererOptions: { collapseErrors: false },
+    },
   ).run();
 
   return taskCtx;