flutter-perf-profiling-and-validation

Use when capturing a baseline before optimising, confirming an improvement after, or whenever a performance claim needs evidence. Measures and validates Flutter performance work: flutter run --profile on physical devices, DevTools frame timings (UI vs raster), rebuild tracking, memory and oversized-image checks, realistic large datasets, flutter analyze and flutter test, calculation regression comparison, and backend migration checks when models change. Do not use to implement fixes, and never judge performance from debug mode.