AXOpen

Update AXSharp.* and Inxton.Operon.* package versions in this repo (via scripts/update_axsharp_versions.ps1), verify the build, update the central CHANGELOG.md, and open a PR with a generated description. Use when the user asks to bump/update AXSharp versions or open a dependency-update PR. Defaults to the latest versions from the feed; accepts optional explicit versions.