add trace logging

src/internal/logging/logging.go

@@ -0,0 +1,14 @@
+package logging
+
+import (
+	"context"
+	"log/slog"
+)
+
+// LevelTrace is a custom log level below Debug for very detailed diagnostic output.
+const LevelTrace = slog.Level(-8)
+
+// Trace logs a message at TRACE level using the default logger.
+func Trace(msg string, args ...any) {
+	slog.Default().Log(context.Background(), LevelTrace, msg, args...)
+}