anymd 8.5.7

Patch Changes

• Preserve the --output file when any input fails to convert, including runs with a mix of valid and invalid inputs. A failed conversion no longer replaces an earlier report with empty or partial output.
• Accept -- before input paths, so names starting with - can be converted and filenames such as --help are read literally. Keep the setup client list beside its command in --help.

Documentation

• Clarify output preservation and shell redirection, and mark the Python package as awaiting PyPI publication instead of offering unavailable pip and uvx installs.