The SDK split the HTTP server scaffolding into the new
checker-sdk-go/checker/server subpackage and renamed
CheckerInteractive to server.Interactive. Update main.go to import
server and call server.New, switch the compile-time assertion to
server.Interactive, and isolate the interactive form code behind the
standalone build tag so plugin/builtin builds skip net/http entirely.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
