bundle.ts ORT pthread path

Trap: shipping unpatched ort-wasm-simd-threaded.mjs appears Node-safe, but only because embedding-worker.ts forces numThreads=1. Increasing it makes ONNX Runtime Web reach the pthread path and call new Worker(...), which crashes where no global Worker exists. Fix: keep single-thread execution, or patch the copied module exactly as build-binary-sea does before increasing numThreads.