yaml: add blank line before top-level blocks after yamlfmt

lua/plugins/format.lua

@@ -17,8 +17,8 @@ return {
     opts = {
       formatters_by_ft = {
         lua = { "stylua" },
-        yml = { "yamlfmt" },
+        yml = { "yamlfmt", "blank_yaml_blocks" },
-        yaml = { "yamlfmt" },
+        yaml = { "yamlfmt", "blank_yaml_blocks" },
         nix = { "nixfmt" },
         bash = { "shfmt" },
         php = { "mago_format" },
@@ -31,6 +31,11 @@ return {
         shfmt = {
           append_args = { "-i", "2" },
         },
+        blank_yaml_blocks = {
+          command = "awk",
+          args = { "{ if (NR>1 && $0 ~ /^[A-Za-z_][A-Za-z0-9_.-]*:/) print \"\"; print }" },
+          stdin = true,
+        },
       },
     },
   },