5faef6c012
Typed write/command wrappers now call ensure_mxaccess_success after ensure_command_success, failing on hresult < 0 (COM-correct, matching CLI-08/Python) or any MxStatusProxy.success == 0, via a new boxed Error::MxAccess variant with credential-safe formatting. The raw invoke escape hatch stays unvalidated. archreview: CLI-03 (P0). Verified: cargo fmt/check/test (28) and clippy --all-targets -D warnings clean.