fix: resolve_cluster_by_container_label now actually reads the sm121.cluster label from container metadata instead of inferring cluster from node ownership

src/docker/mod.rs

@@ -204,23 +204,32 @@ pub async fn stop_cluster(
     Ok(())
 }
 
-/// Find the cluster that has running containers for a recipe by querying
-/// the `sm121.cluster` label.  Used by stop/logs when `--cluster auto`.
+/// Find the cluster that has running containers for a recipe by reading
+/// the `sm121.cluster` label from live containers.  Used by stop/logs
+/// when `--cluster auto`.
 pub async fn resolve_cluster_by_container_label<'c>(
     config: &'c Config,
     recipe_name: &str,
 ) -> Result<&'c Cluster> {
-    for cluster in &config.clusters {
-        for node in &cluster.nodes {
-            let cmd = format!(
-                "docker ps -q --filter \"label=sm121.recipe={}\" \
-                 --format '{{{{.Names}}}}' | head -1",
-                recipe_name
-            );
-            if let Ok(output) = run_ssh(config, node, cmd, false).await
-                && !output.trim().is_empty()
-            {
-                return Ok(cluster);
+    // Scan all nodes for containers matching this recipe.
+    for node in config.clusters.iter().flat_map(|c| &c.nodes) {
+        let cmd = format!(
+            "docker ps -q --filter \"label=sm121.recipe={}\" \
+             --format '{{{{.Label \"sm121.cluster\"}}}}' | head -1",
+            recipe_name
+        );
+        if let Ok(output) = run_ssh(config, node, cmd, false).await {
+            let cluster_label = output.trim();
+            if !cluster_label.is_empty() {
+                // Found a container — match its cluster label against config.
+                return config
+                    .clusters
+                    .iter()
+                    .find(|c| c.name == cluster_label)
+                    .context(format!(
+                        "Container label says cluster '{}', but no such cluster in config",
+                        cluster_label
+                    ));
             }
         }
     }