The Linux and macOS jobs were near-identical copies; their shared head
(checkout, SDK setup, version, restore, build, both test steps, test-log
upload) drifts the moment one is edited and the other is not. Collapse
them into a single platform-parameterized matrix job, and hoist the .NET
SDK version/quality and the staging directory to workflow-level env so an
SDK bump is a one-line change across all jobs.
The Windows job keeps its id (Build) so internal references stay stable,
but gains a display name to read as "Desktop (Windows)" alongside the
matrix "Desktop (linux)/(macos)" checks. Branch-protection required
checks must be repointed to the new check names.
Assisted-by: Claude:claude-opus-4-8:Claude Code
Christoph Wille
c6ec2c5893