Function classifyInterval

classifyInterval(semitones: number, twoVoice?: boolean): ConsonanceClass
Classify an interval for counterpoint evaluation.

The interval is reduced modulo 12, so compound intervals classify as their simple equivalents. The perfect fourth (5) is context-dependent: with twoVoice (the default) it classifies as a dissonance, matching isConsonantInterval; otherwise it is an imperfect consonance.
Parameters
- semitones: number
  Interval size in semitones (may be negative or compound).
- twoVoice: boolean = true
  When true, the perfect fourth is treated as dissonant.
Returns ConsonanceClass
The counterpoint quality of the interval.
Example
```
import { classifyInterval, ConsonanceClass } from '@libraz/libcantus';
classifyInterval(7); // ConsonanceClass.PerfectConsonance
classifyInterval(5); // ConsonanceClass.Dissonance (two-voice)
classifyInterval(5, false); // ConsonanceClass.ImperfectConsonance
```
- Defined in src/core/interval/index.ts:62