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gh-145176 Move Emscripten files into Platforms/emscripten (#145806)
GH-143941: Move WASI-related files to Platforms/WASI (GH-143942)
gh-139590: Stricter `ruff` rules for `Tools/wasm` (#139752)
GH-133600: Refactor `wasi.py` into `wasi/__main__.py` Along the way, also move related files into their appropriate directories and update `.github/CODEOWNERS`.