Member Audit: Project contains an invalid CHT maintainer(s)

Summary

This projects hardening_manifest.yaml maintainers list appears to contain an invalid cht_member

The following members have been identified as invalid, please remove them and ensure at least one cht_member is assigned and valid.
Invalid Users:

• sean.melissari

Questions?

Contact the Iron Bank team by commenting on this issue with your questions or concerns. If you do not receive a response, add /cc @ironbank-notifications/onboarding.
Additionally, Iron Bank hosts an AMA working session every Wednesday from 1630-1730EST to answer questions.

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Errors?

If this issue was incorrectly opened, or you have an improvement/suggestion please open an issue here
Please use the Plugin::Repo Audit tag when creating said issue so we know what robotnik plugin it is associated with.