rlx-web 0.2.13

WebAssembly entry point for RLX — run models in the browser (CPU backend; WebGPU device bring-up)
Documentation 
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One command, all platforms (macOS / Linux / Windows):

    python3 crates/rlx-web/build.py            # CPU build -> web/pkg
    python3 crates/rlx-web/build.py --webgpu   # also bring up a WebGPU device
    python3 crates/rlx-web/build.py --serve     # build + serve the demo

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