[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 623c6e8fa1f76ed02fc74dfe178061e7b6ef7aec, which includes the loader support and wasm32 browser default.

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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