163dd7ab5c
The build-platform note added alongside the proto wiring quoted docker-dev's `FROM --platform=linux/amd64` verbatim inside an MSBuild comment. XML forbids '--' in a comment, so MSBuild refused to load the project at all (MSB4025) -- a total build stop for every consumer of .Contracts, i.e. the whole MQTT driver, the Host, and the test suite. Reworded to name the platform in prose. Caught by rebuilding after the edit; the preceding commit was made from a build that predated it. Claude-Session: https://claude.ai/code/session_01GASWkNEi68FSCtvr6rLoEW