fix list-restorable.sh process-substitution infinite loop in volume-keys read loop

Regression from d896378e: putting < <(...) on `read` re-runs the producer each iteration. Capture required volume keys once and feed via done<<<.

list-restorable.sh

@@ -121,7 +121,6 @@ while IFS= read -r entry; do
     fi
     
     compose_file=$(echo "$entry" | jq -r '.compose_file')
-    volumes=$(echo "$entry" | jq -r '.volumes[]')
     
     # Check if compose file exists
     compose_path="${dir}/${compose_file}.yml"
@@ -134,9 +133,12 @@ while IFS= read -r entry; do
     missing_volumes=()
     backup_info=()
     
-    # Get required persistent volumes (excluding ephemeral and optional)
-    # Use process substitution to avoid subshell issues
-    while IFS= read -r volume < <(get_required_volume_keys "$compose_path"); do
+    # Required persistent volumes only (exclude ephemeral + optional).
+    # Must feed the loop via done<<< / done< <(...) — putting < <(...) on
+    # `read` re-runs the producer every iteration and infinite-loops on the
+    # first key (vibe regression 2026-08-04 d896378e).
+    volumes=$(get_required_volume_keys "$compose_path")
+    while IFS= read -r volume; do
         volume_name="rpc_${volume}"
         # jwt/secrets volumes are regenerated at create-node — never backed up by
         # design, so they must not gate restorability (kept plasma marked