* fix fail-open for grayswan; pass metadata to cygnal api endpoint; update docs
* pass litellm_metadata to cygnal in payload
* switch error msg to const, and clean exception handling.
* update pyproject.toml as requested
* Revert "update pyproject.toml as requested"
This reverts commit 4eece154d056ba33689a5584c86c8fc352bb7cdd.