Prepare release 6.0 "stable"

[Copilot]

Prepare version 6.0 release with comprehensive changelog documenting 30 commits since 5.0, including critical bug fixes and memory profiling features.

Changes

• CHANGELOG.md - Complete changelog following Keep a Changelog format

  • 3 critical bug fixes: buffer overflow, node growth corruption, iterator crash
  • Memory benchmarking feature via make bench-mem
  • CMake 3.0 → 3.12, CI/CD enhancements

• RELEASE_NOTES.md - GitHub release content with highlights, impact analysis, and upgrade recommendations

• Git tag 6.0 - Annotated tag on commit b5621fb (locally created, not pushed)

• create_release.sh - Automated release script with repository auto-detection

• RELEASE_INSTRUCTIONS.md, RELEASE_SUMMARY.md, TASK_COMPLETION.md - Supporting documentation

Contributors Acknowledged

Issue reporters: @hiqsociety (#16), @Haibarapink (#21), @YelaShady (#19)
PR authors: @copilot (#24, #25, #29, #30, #31), @rafaelkallis
Commit authors: @rafaelkallis, @copilot-swe-agent[bot]
Co-authors: @bowling233
Release manager: @copilot-swe-agent[bot]

Publishing

Tag created locally. To publish:

./create_release.sh
# or manually: git push origin 6.0 && gh release create 6.0 --title "6.0 - stable" --notes-file RELEASE_NOTES.md

Original prompt

prepare a new release with name stable. You should create a tag 6.0. Include a changelog in the release notes and make sure you aknowledge commit authors, issue authors and PR authors. Make sure you also mention yourself!

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