fix(reverb): pink-weighted IR normalization and equal-power mix

The wet path ran up to +23.6 dB hot and two thirds of the parameter grid
clipped. Normalize the built impulse response to unit pink-weighted energy
and use an equal-power dry/wet law, identically in Python and C++.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
1d58332d00flamboh committed on 10/12/2026, 11:04:54 AMparentc072063
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