v0.3.0 — Harmonic EQ

8-band zero-latency parametric EQ + dynamic EQ + feed-forward compressor + I/O trim,
now with a Harmonic band character.

New in this release

• Harmonic character: a third per-band option alongside Modern/Vintage. Layers
  gain-driven even/odd harmonic saturation on top of the standard linear response.
  Even harmonics (warm, tube-like) come from an asymmetric quadratic waveshaper; odd
  harmonics (grittier, transistor-like) come from a tanh waveshaper; a per-band blend
  slider crossfades between them. Drive scales with the band's own applied gain, so a
  band left at 0dB stays transparent.
• Uses first-order antiderivative anti-aliasing (ADAA) instead of oversampling, so
  the added harmonic content stays clean without adding latency.

Verified

• pluginval (VST3 + AU, strictness 5): clean pass.
• Real audio through the actual shipped processor class, FFT-checked: the even
  generator produces exactly the fundamental + 2nd harmonic and nothing else; the odd
  generator produces exactly odd harmonics and nothing else. Zero added latency
  confirmed throughout.

Known limitations

• No preset system yet.
• Meters are simple peak reads, not ballistics-accurate.
• Dynamic EQ detection is internal only (no external sidechain input yet).
• Not yet tested against real audio hardware in a live signal chain.

Both roadmap items from v0.2.0 (dynamic EQ, harmonic EQ) are now shipped.