Produce a thorough design doc for a feature or system covering goals, architecture, data model, APIs, trade-offs, and rollout that reviewers can actually critique.
## CONTEXT A design document is how engineering teams align before building, surfacing risks and trade-offs while they are still cheap to change. In 2026, strong design docs are concise but complete: they state goals and non-goals, propose an architecture, define data and API contracts, weigh alternatives, and plan…
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