Include the missing C++ sources, Laya WASM integration, portable build and
verification tools, source packaging, and component usage documentation.
Use the WASM backend in the four retained examples.

Ship the verified single-thread JS/WASM pair with preserved resource UUIDs
and a manifest binding the artifacts to their source and verification inputs.
Keep historical baselines and add fresh four-scene correctness evidence.

Validation: TypeScript noEmit, ABI schema check, native registered-runtime
smoke with 16 lifecycle repetitions, and four portable real-scene correctness
runs with 6 warmup and 12 sampled frames each.