[FLwolfy]

Summary

Restructure engine layers, platform ownership, and backend integrations to provide clear extension points for new platforms, backends, and deployment models.

Changes

• Enforce boundaries between Foundation, Content, Services, Runtime, and composition.
• Separate Rendering Core, Assets, Authoring, and Runtime.
• Centralize shared backends under backends/ and platform implementations under platforms/.
• Isolate platform-specific backend adaptation in dedicated integration libraries.
• Separate shared Editor/Player lifecycles from platform entry points.
• Introduce path-independent content access with integrity validation, safe concurrency, cancellation, and atomic publication.
• Separate content compilation from platform packaging.
• Centralize distribution registration, binding generation, Native builds, and MSBuild Task preparation.
• Retire rendering surfaces before destroying additional viewport windows.
• Update consumers, Solution organization, architecture checks, Wiki documentation, and README.
• Remove superseded implementations and entry points.

Validation

• 708 related regression tests passed.
• Architecture checks and the evaluated MSBuild dependency graph passed for all 229 projects.
• No orphaned projects, empty Solution folders, or unowned source files.
• Windows Editor Debug/Release builds, hidden execution, and shutdown passed.
• FlappyBird publishing and execution passed for:
  • Windows CoreCLR
  • Windows NativeAOT
  • Web interpreted
  • Web AOT
• Canvas, Rendering2D, Plugin, and scripting consumer validation passed.
• Player deployment closures exclude Editor, Authoring, dynamic loaders, and build tools.

Remaining Validation

• macOS products and Linux Native tooling require validation on their respective hosts.
• Some GUI interactions, multiple-monitor DPI, live resize, and physical audio remain unverified.
• The Native phase became faster, but total warm-build time did not improve. Measurements are documented.

Documentation and Compatibility

• Simplify README onboarding, startup instructions, platform status, and extension navigation.
• Document architecture, ownership, lifecycles, and acceptance evidence under docs/architecture/.
• This change updates public APIs and project paths. Consumers must use the corresponding current source; no compatibility wrappers are retained.