ClassPrinter silently drops MethodParametersAttribute in TRACE_ALL mode

[wenshao]

In ClassPrinterImpl.attributesToTree(), the MethodParametersAttribute case builds a MapNodeImpl representing method parameters but never adds it to the nodes list. This causes method parameter names and access flags to be silently omitted from the output when using Verbosity.TRACE_ALL.

All other attribute cases in the same switch expression correctly call nodes.add() after constructing their nodes.

• Before:

  case MethodParametersAttribute p -> {
      Node n = map("method_parameters", ...);
      // missing: nodes.add(n);
  }

• After:

  case MethodParametersAttribute p -> {
      Node n = map("method_parameters", ...);
      nodes.add(n);
  }

---

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