A Soul pass found the two sides compile against different stdlib text:
the wasm bundle's si.smooth stalls in float32, the sandbox's faustlibraries
master does not. Reword the report, README and render.js; fail on length
mismatch and render errors; check output count; match controls exactly;
default output under the temp dir.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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