Quoin v0.28.3

What's Changed

• Use shared ix-cli-kit outcomes and canonical JSON by @kreneskyp in #675
• Correct CLI kit review artifact schema by @kreneskyp in #676
• Refresh Discord invite link by @kreneskyp in #678
• Add IX agent skills badge beside Discord by @kreneskyp in #682
• Add plugin setup and scoped community help by @kreneskyp in #683
• PLAT-1156: remove update-log producers and prepare 0.28.3 by @kreneskyp in #685
• Align Quoin default catalog with ISO 0.3.0 by @kreneskyp in #686

Full Changelog: v0.28.1...v0.28.3