Initial commit: InTono — app KMP per l'apprendimento musicale

App Kotlin Multiplatform (Android/iOS/Desktop) con Compose Multiplatform:
controllo intonazione (YIN), pratica guidata, metronomo, ear training,
sfide, scansione spartiti via AI, spartiti bundled e pentagramma con
glifi tipografici, travature, battute e spaziatura proporzionale.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shared/src/commonMain/kotlin/com/notemusicali/audio/InstrumentPreset.kt

@@ -0,0 +1,77 @@
+package com.notemusicali.audio
+
+enum class InstrumentPreset(
+    val displayName: String,
+    val minFrequency: Float,
+    val maxFrequency: Float,
+    val yinThreshold: Float,
+    val bufferSize: Int,
+    val minOctave: Int,
+    val maxOctave: Int,
+    val description: String,
+) {
+    VIOLINO(
+        displayName = "Violino",
+        minFrequency = 180f,
+        maxFrequency = 2700f,
+        yinThreshold = 0.15f,
+        bufferSize = 2048,
+        minOctave = 3,
+        maxOctave = 7,
+        description = "G3-E7 \u2022 Ottimizzato per archi",
+    ),
+    VIOLA(
+        displayName = "Viola",
+        minFrequency = 120f,
+        maxFrequency = 1800f,
+        yinThreshold = 0.15f,
+        bufferSize = 2048,
+        minOctave = 3,
+        maxOctave = 6,
+        description = "C3-A6 \u2022 Ottimizzato per archi",
+    ),
+    VIOLONCELLO(
+        displayName = "Violoncello",
+        minFrequency = 60f,
+        maxFrequency = 1100f,
+        yinThreshold = 0.15f,
+        bufferSize = 4096,
+        minOctave = 2,
+        maxOctave = 6,
+        description = "C2-C6 \u2022 Buffer ampio per note basse",
+    ),
+    PIANOFORTE(
+        displayName = "Pianoforte",
+        minFrequency = 27f,
+        maxFrequency = 4200f,
+        yinThreshold = 0.10f,
+        bufferSize = 4096,
+        minOctave = 0,
+        maxOctave = 8,
+        description = "A0-C8 \u2022 Soglia bassa, segnale pulito",
+    ),
+    CHITARRA(
+        displayName = "Chitarra",
+        minFrequency = 78f,
+        maxFrequency = 1400f,
+        yinThreshold = 0.12f,
+        bufferSize = 2048,
+        minOctave = 2,
+        maxOctave = 6,
+        description = "E2-E6 \u2022 Corde pizzicate",
+    ),
+    VOCE(
+        displayName = "Voce",
+        minFrequency = 75f,
+        maxFrequency = 1200f,
+        yinThreshold = 0.15f,
+        bufferSize = 2048,
+        minOctave = 2,
+        maxOctave = 6,
+        description = "D2-D6 \u2022 Range vocale esteso",
+    ),
+
+    ;
+
+    val octaveRange: IntRange get() = minOctave..maxOctave
+}