feat(nisps/dsp): lean DSP primitives ported from maximilian (meml-1v6)
Header-only, heap-free, sample-rate-aware DSP primitives for stream 3:
- Biquad (LPF/HPF/BPF/Notch/Peak/LowShelf/HighShelf, denormal flush)
- Delay<N> + DynamicDelay<N> (fixed-length feedback + power-of-two
ring with fractional read & smoothed offset)
- AllPass / Comb / LpComb (Schroeder-Moorer reverb sections, split per
role rather than maximilian's one-class-many-roles maxiReverbFilters)
- DCBlocker (one-pole HPF)
- ChamberlinSVF + OnePoleSmoother<NCh> + EnvelopeFollower
- ADSR envelope generator
- SineOsc/SawOsc/SquareOsc, PAFOperator (port of maxiPAFOperator with
static gauss/cauchy tables), FMOp single-operator FM building block
- PitchShifter<N> granular two-head crossfade (replaces daisysp PitchShifter)
Tests: biquad freq-domain attenuation, delay tap timing, reverb
boundedness, pitch-shifter ratio + finite output. All pass under
-Wall -Wextra -Werror -Wpedantic, C++20.
973455b158