cbodotnetup 0.1.0 - verified Community Build SDK manager

SDK-free NativeAOT installer for qualified Community Build of .NET SDKs. Verify the current project-signed installation catalog and its independently pinned OpenPGP key. Linux glibc x64/AArch64; Ubuntu24.04, Debian13, Fedora45 and Rocky9.8. Initial SDK:10.0.403. Native runtime 10.0.14; the SDK payload stays unchanged. Per-user roots preserve official and package-managed commands. Each binary has exact signed native runtime/project license and third-party notices in its adjacent .LICENSE.txt asset. Build/source records are retained; current signed catalog qualification is published separately. This release does not replace the latest SDK download.