Fix AROS64 XADOpen and CLI crashes

[midwan]

Summary

• fix AROS x86_64 DOpus ARexx message metadata so XADOpen no longer dereferences a truncated stem-list pointer in FreeRexxMsgEx
• build the internal CLI console name without RawDoFmt string varargs on AROS x86_64
• add source-level regression tests for both failure modes

Validation

• python3 -m unittest source.Program.tests.test_cli_console_cleanup source.Library.tests.test_rexx_aros64_tracking source.Modules.xadopus.tests.test_aros64_callback_layout
• find source -path '*/tests/test*.py' -print0 | xargs -0 -n1 python3
• podman run --rm -v /home/midwan/Github/dopus5:/work --workdir /work/source midwan/aros-compiler:x86_64-aros make x86_64-aros all debug=yes

[chatgpt-codex-connector]

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