feat(audio): musical modes + octave band compression + 17-EDO pitch classes

Quintenzirkel-inspired module mapping Base17 golden step to musical structure:

modes.rs:
  7 musical modes (Ionian→Locrian) mapped to highheelbgz strides:
    Ionian=Gate(8), Dorian=V(5), Phrygian=QK(3), Lydian=Up(2),
    Mixolydian=Down(4), Aeolian=QK(3), Locrian=Gate(8)
  Mode::tension() for HHTL skip threshold modulation.
  mode_band_weights() for spectral coloring per mode.
  circle_of_fifths_progression() and minor_progression().

Octave band compression (from user insight):
  Same tone across octaves = one transposed band modulation.
  OctaveBand: canonical 3-element pattern + octave offset (u8).
  transpose(): shift octaves, pattern stays identical.
  compress_to_octaves(): 21 bands → 7 OctaveBand triplets.
  from_fundamental(): harmonic decay rate → pattern.

PitchClass17: 17-EDO circle of fifths via golden step (11/17):
  gcd(11,17)=1 → visits all 17 pitch classes without repetition.
  Same generator that Base17 golden-step walk uses for 17 dimensions.
  Maps to thinking-engine Qualia17D dims (arousal, valence, tension...).

10 tests passing. Links to QPL calibration from thinking-engine.

https://claude.ai/code/session_01NYGrxVopyszZYgLBxe4hgj

Author: claude

src/hpc/audio/mod.rs

@@ -19,3 +19,4 @@ pub mod pvq;
 pub mod codec;
 pub mod mel;
 pub mod voice;
+pub mod modes;