Add safearena - Safe arena memory management

[scttfrdmn]

Adds safearena to the Performance section.

Quality Links

Forge link: https://github.com/scttfrdmn/safearena
pkg.go.dev: https://pkg.go.dev/github.com/scttfrdmn/safearena
goreportcard.com: https://goreportcard.com/report/github.com/scttfrdmn/safearena
Coverage: https://codecov.io/gh/scttfrdmn/safearena

What is SafeArena?

Safe wrapper around Go's experimental arena package that prevents use-after-free and double-free bugs through runtime checks and static analysis.

Why add it?

• Unique solution for safe arena memory management in Go
• Production-quality: 97% test coverage, comprehensive documentation
• Real-world examples with performance benchmarks
• Static analyzer tool (arenacheck) for compile-time detection
• Active development and maintenance

Project Stats

• 97% test coverage (Codecov)
• CI on Linux and macOS, Go 1.23–1.25
• Comprehensive documentation (Migration guide, FAQ, Performance guide)
• Real-world examples (JSON parser, DB processor, image filters)
• Static analyzer (arenacheck)
• Go 1.23+ support

Placement

Added to Performance section in alphabetical order between profile and statsviz.

[github-actions]

Automated Quality Checks (from CONTRIBUTING minimum standards)

• Repo: OK
• pkg.go.dev: OK
• goreportcard: OK (grade unknown)
• coverage: OK

These checks are a best-effort automation and do not replace human review.