Use when a feature needs to be measurable — defining what events/metrics to track, naming and structuring them, tying the feature to success + guardrail metrics, and (optionally) designing an experiment to evaluate it. Triggers: "what should we track", "instrumentation", "analytics events", "Amplitude", "how do we measure success", "A/B test", "experiment", success metrics from a `prd`. Defines an Amplitude-style event model and points validation queries at BigQuery.
