[!todo] Seed note. A starting point, not a finished note yet.
Progressive delivery ships a change to a small percentage of users (a canary), watches health metrics, and automatically promotes it to everyone or rolls it back based on what production shows. It is usually implemented with feature flags plus continuous verification, moving the safety decision from review time to runtime. It matters in the AI era as a way to relax the review bottleneck: if code cannot be fully trusted before merge, make shipping cheap to reverse and catch failures fast. The limit is that telemetry only catches what it can see, so silent logic or data-corruption bugs slip through. Seeded from Rebuilding Review and Deployment for the AI Era.