Faust prototype: per-voice WASM engine, DX7 sysex pipeline, port map

Benchmarked: recompile-free timbre (144-param DX7 patch swap in 0.43ms live), clean at 8x CPU throttle, offline node rendering 3x realtime. dx7.lib + sysex2params.js decode any cartridge bank (learnfm corpus compatible).

▶ Play it: Ballroom Leviathan — a horn-and-piano genre that plays almost entirely sampled instruments https://stellate.app/?genre=bigband&seed=1654&path=814.14134,833.14167,795.14167&xdur=13.122

fe22b5e https://github.com/aboard-io/stellate/commit/fe22b5e6874bb005d93c06e689f028b683af83ee