The benchmark adapter only recognized GOOGLE_API_KEY and parsed the legacy
text/usage event shape. Recognize GEMINI_API_KEY and ~/.gemini/.env, parse
the current content/stats schema, ignore echoed user messages, and run
report-only plan mode with --skip-trust for disposable workspaces.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
