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The runner execs a script without __file__ or __name__: the Test button failed on __file__ and render-mail-template never reached main(). The test no longer imports the renderer, and the renderer calls main() unconditionally like the other integrations. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BJu1jvaug4qY1kMgz8wx41