INT4 vision (251MB) + chunked Range downloads (fix 1.7GB stall); verified end-to-end in Chrome WebGPU

Add wasm fallback EP

Pin CDN versions (ort 1.23.0, transformers 3.8.1)

In-browser WebGPU LocateAnything-3B (INT4 + KV cache + custom 4-bit embedding gather)