Bevy 0.18 → 0.19 migration

Bevy 0.19.0 was released on 2026-06-19. Target bevy = "0.19" and validate against the latest 0.19 patch release. Apply the official migration guide from top to bottom; this skill prioritizes changes most likely to affect game code and sibling skills.

First-pass checklist

1. Update the engine and every Bevy ecosystem crate together. A crate built on Bevy 0.18 cannot share ECS/assets/render types with Bevy 0.19.
2. Rebuild with the project's real default-features and target triples.
3. Fix resources and broad-query conflicts before chasing secondary system errors.
4. Update scenes, text, assets, rendering, lights, and UI focus.
5. Regenerate persisted animation target IDs and serialized world data.
6. Compile representative examples and exercise native and web/platform builds.

High-impact changes