fix: rewrite parse_reference without if-then-else (unsupported in yq v4)

The previous expression used `if ($r | type) == "!!str" then ... end`
which produces a lexer error in yq v4.50–v4.53. This caused every
parse_reference call to return empty output, silently skipping all
references — the root cause of the missing [INFO] messages and tree.

Replace with a single-line expression using only the // alternative
operator and select(), which work across all tested yq v4 versions:

  .references[N] | (.url // .) + "|" + (.into // "") + "|" +
  (.ref // "") + "|" +
  ((.env | select(tag == "!!seq") | join(",")) // .env // "")

.url // . handles both string refs (no .url key) and object refs.
env arrays are joined; null env falls back to "".

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/arty.sh

@@ -282,20 +282,10 @@ parse_reference() {
   local config_file="$1"
   local ref_index="$2"
 
-  # Single yq call for all fields — multiple calls per reference were flooding
+  # Single yq call using only // and select — if-then-else is not supported in
-  # the process table on hosts with low ulimit -u (e.g. IONOS shared hosting),
+  # all yq v4 builds. .url//.  handles both string refs (no .url key) and object
-  # causing intermittent empty 'into' values and wrong install locations.
+  # refs. env array is joined; null env falls back to empty string.
-  yq eval "
+  yq eval ".references[$ref_index] | (.url // .) + \"|\" + (.into // \"\") + \"|\" + (.ref // \"\") + \"|\" + ((.env | select(tag == \"!!seq\") | join(\",\")) // .env // \"\")" "$config_file" 2>/dev/null
-    .references[$ref_index] as \$r |
-    if (\$r | type) == \"!!str\" then
-      \$r + \"|||\"
-    else
-      ((\$r.url  // \"\") | if . == \"null\" then \"\" else . end) + \"|\" +
-      ((\$r.into // \"\") | if . == \"null\" then \"\" else . end) + \"|\" +
-      ((\$r.ref  // \"\") | if . == \"null\" then \"\" else . end) + \"|\" +
-      (\$r.env | if . == null then \"\" elif type == \"!!seq\" then join(\",\") else (. | if . == \"null\" then \"\" else . end) end)
-    end
-  " "$config_file" 2>/dev/null
 }
 
 # Check if current environment matches the filter