Bevy 0.18 integration and API migration across three repositories (facebook/pyrefly, facebook/sapling, pytorch-labs/monarch) in April 2026. Implemented a comprehensive Bevy 0.18 import with wgpu-types 27, added multiple sub-crates, and performed extensive compatibility fixups to enable stable cross-crate builds and improved performance. Migrated 74 example files to Bevy 0.18 API usage and added Meta license headers for compliance. Upgraded core dependencies (wgpu-types 27, sysinfo 0.37, accesskit 0.21) and introduced supporting transitive crates (text shaping, font rendering, audio, UI layout). Executed 77 fixups across five categories (cargo_env, extra_srcs, omitted features, build-script/overlay updates) to resolve wasm32, windowing, and arvr-related conflicts. Delivered first-party changes to bevy_demo assets and ensured alignment of examples with the new API.