* Add five community security skills for agent specialization
Expand coverage with OAuth flow testing, AWS misconfigurations, prototype
pollution, insecure deserialization, and Django framework playbooks.
* Address Greptile review feedback on AWS and deserialization skills
- Use head-bucket for S3 existence checks instead of duplicating s3 ls
- Add Node.js to insecure_deserialization frontmatter description
* Clarify S3 existence vs public listing checks in aws skill
Split unauthenticated enumeration into separate head-bucket/HTTP
and s3 ls steps with interpretation guidance per review.
* some tools ads
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Co-authored-by: bearsyankees <bearsyankees@gmail.com>