feat: buffer tracing logs before console init

tests/tracing_buffer.rs

@@ -0,0 +1,19 @@
+use pacman::platform::tracing_buffer::SwitchableWriter;
+use std::io::Write;
+
+#[test]
+fn test_switchable_writer_buffering() {
+    let mut writer = SwitchableWriter::default();
+
+    // Write some data while in buffered mode
+    writer.write_all(b"Hello, ").unwrap();
+    writer.write_all(b"world!").unwrap();
+    writer.write_all(b"This is buffered content.\n").unwrap();
+
+    // Switch to direct mode (this should flush to stdout and show buffer size)
+    // In a real test we can't easily capture stdout, so we'll just verify it doesn't panic
+    writer.switch_to_direct_mode().unwrap();
+
+    // Write more data in direct mode
+    writer.write_all(b"Direct output after flush\n").unwrap();
+}