SIGClinical

A new SIG.

https://www.aclweb.org/adminwiki/index.php?title=SIG_Compliance#SIGClinical:_SIG_on_clinically_related_language

No specific files, tests, or commands are named in the issue. Start by locating where SIG records are defined in the repo and how they are rendered in the Anthology output. Mirror an existing SIG entry to add SIGClinical in the same format, then run the normal generation/check path used for SIG or data updates to verify it appears in the listing. The task is complete when SIGClinical is present in the generated SIG list.

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