Add Guard Core JVM to Security

[rennf93]

Suggestion type

• Project
• Resource

Checklist

• I searched the list and existing issues for duplicates.
• I changed README_SOURCE.md, not the generated README.md.
• This pull request contains one suggestion.
• The suggestion is relevant to Java or the JVM and fits its chosen category.
• I used the canonical project or resource link.
• The suggestion is current and maintained.
• The concise, neutral description explains its distinguishing value and ends with punctuation.
• Licensing is clear and any restrictive terms are disclosed where applicable.

I'm the author. Guard Core JVM is a framework-free request security engine published to Maven Central (com.guard-core:guard-core, latest 4.4.0) with Spring Boot and Ktor adapters. Its distinguishing value is that it runs the same detection rules and shares the same Redis rate-limit and ban state as the project's Python, Go, Rust, PHP and TypeScript engines, so a mixed-language fleet enforces one policy.

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Summary by cubic

Adds Guard Core JVM to the Security libraries section of README_SOURCE.md.

The entry highlights that it runs the same detection rules and shares Redis rate-limit and ban state as the project's Python, Go, Rust, PHP, and TypeScript engines, so a mixed-language fleet enforces one consistent policy.

^{Written for commit 904d657. Summary will update on new commits.}

Project background: Guard Core's first library is fastapi-guard, public since August 2024 (first PyPI release, 0.1.0, on 2024-08-26). It has 825 GitHub stars, 65 releases and about 62,000 PyPI downloads in the last month (pypistats.org). The framework-agnostic engines and the adapters for other frameworks and languages came later and run the same detection rules, checked in CI against shared conformance fixtures.

[cubic-dev-ai]

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