[hlolli]

Depends on csound/csound#3556. Keep this draft until that PR merges and matching npm releases can replace the temporary source checkout in CI.

The current wasm32 double plugins do not match either new engine. Build Chua, image, linear algebra, and STK for both wasm32-wasip2 with float samples and wasm64-wasip2 with double samples, using the matching Csound SDKs and source-built Nix toolchains. Wasm64 assets use the -wasm64.wasm suffix.

@csound/plugins selects wasm32 float to match the default browser engine. The /wasm32 and /wasm64 entry points each export one plugins object. Use /wasm64 with the opt-in @csound/browser/wasm64.js module. Static dependencies follow the selected target, and the linear-algebra code now accepts float samples.

Each plugin keeps its own Preview 2 file descriptors while following the engine's working directory. Wasm64 plugins embed adapters for their WASI imports, including STK's directory creation. CI pins csound/csound#3556 at 23eaa7fa28cadf26b2c453d53b8e789986e3bdf5, which includes WASI 0.2.12, LLVM 23.1.3, the loader support, and the wasm32 browser default. Keep the same nixpkgs pin and use libc++'s stream-copy fallback where WASI lacks Linux's copy_file_range.

The existing npm dependency versions predate Preview 2. Until matching releases exist, CSOUND_WASM_PACKAGE selects a built upstream source tree; the README describes that setup and the release steps.

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