Loads a golden WAV, takes the loop region from loop.detect, and
runs each effect through applyQuantumOp on a fresh copy.
Badges are sample-exact: STUTTER must write the first-10 ms slice verbatim at
start + k·span (k=0..3); FRACTAL must equal a manual reverse of
the loop's first half with the rest untouched; PHASE must differ inside the
loop and stay bit-identical outside it (in-place containment). The phase
effect running at all proves the 2026-07-02 repair — parameters are now an
explicit options argument, not a window.phaserParams bus read
(it crashed headless before). Same asserts spot-run in Node pre-ship.