📝 align portable examples and release messaging

examples/presets/main.mbt

@@ -1,27 +1,45 @@
 fn main {
   let config = @lib.with_queue(
-    @lib.with_file_rotation(
+    @lib.text_console(
+      min_level=@lib.Level::Info,
+      target="demo.preset",
+      text_formatter=@lib.TextFormatterConfig::new(
+        show_timestamp=false,
+        separator=" | ",
+      ),
+    ),
+    max_pending=4,
+    overflow=@lib.QueueOverflowPolicy::DropOldest,
+  )
+
+  let logger = @lib.build_logger(config)
+  logger.info("preset logger ready", fields=[@lib.field("kind", "portable")])
+  logger.info("preset logger queued", fields=[@lib.field("step", "two")])
+  ignore(logger.flush())
+
+  if @lib.native_files_supported() {
+    let file_config = @lib.with_file_rotation(
       @lib.file(
         "preset-example.log",
         min_level=@lib.Level::Info,
-        target="demo.preset",
+        target="demo.preset.file",
         auto_flush=true,
       ),
       256,
       max_backups=2,
-    ),
-    max_pending=4,
-    overflow=@lib.QueueOverflowPolicy::DropOldest,
-  ) catch {
-    err => {
-      ignore(err)
-      println("invalid preset config")
-      return
+    ) catch {
+      err => {
+        ignore(err)
+        println("invalid file preset config")
+        return
+      }
     }
-  }
 
-  let logger = @lib.build_logger(config)
-  logger.info("preset logger ready", fields=[@lib.field("kind", "preset")])
-  ignore(logger.flush())
-  ignore(logger.file_close())
+    let file_logger = @lib.build_logger(file_config)
+    file_logger.info("file preset ready", fields=[@lib.field("kind", "native-only")])
+    ignore(file_logger.flush())
+    ignore(file_logger.file_close())
+  } else {
+    println("file presets are skipped on this backend because native file support is unavailable")
+  }
 }