Request telemetry records whether you are on the default model and effort

Each assistant response now reports is_default_model, default_model, is_default_effort and default_effort_level, letting Anthropic separate traffic on the shipped defaults from explicitly chosen models. A helper resolves the model actually in use and compares it against the automatic model set and the configured default; when the comparison is ambiguous the fields are omitted rather than guessed. The same event also records requestBodyCompression, the gzip outcome for that request. No gate, and nothing visible in the app.