feat: add Arp de Lévy app

docs/apps/34-arp-de-levy/manual.json

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+{
+  "id": 34,
+  "slug": "arp_de_levy",
+  "name": "Arp de Levy",
+  "status": "wip",
+  "tag": "draft",
+  "description": "Lévy-flight generative arpeggiator — evolve, texture, and expression",
+  "color": "Rose",
+  "icon": "SoftRandom",
+  "channels_count": 1,
+  "cv_jack": true,
+  "params": [
+    "MIDI Channel",
+    "Base Note",
+    "Color",
+    "MIDI Out",
+    "V/Oct",
+    "Bypass quantizer",
+    "Jack",
+    "Range",
+    "CV Out",
+    "CV Dest",
+    "CV Att",
+    "Follow device tonic"
+  ],
+  "storage": [
+    "Mutation rate",
+    "Texture",
+    "Lévy α",
+    "Expression",
+    "Octave span",
+    "Muted",
+    "Reversed",
+    "Note pool",
+    "Phrase length"
+  ],
+  "columns": [
+    {
+      "sections": [
+        {
+          "heading": "Mutation, texture, flight",
+          "items": [
+            "Persistent note pool walked with <strong>Lévy-flight</strong> steps — mostly small moves, occasional leaps",
+            "CV (1V/oct, quantized unless <strong>Bypass quantizer</strong>) and MIDI fire together on each hit",
+            "<strong>Mutation rate</strong> freezes the pool at the bottom; more Lévy edits at each phrase boundary as you raise it",
+            "<strong>Texture</strong> jointly moves density (rests), phrase length (16 down to 4 steps), and swing",
+            "<strong>Button + Fader</strong> sets Lévy <strong>α</strong> (local ↔ wild jump character)"
+          ]
+        }
+      ]
+    },
+    {
+      "sections": [
+        {
+          "heading": "Gestures",
+          "items": [
+            "<strong>Fader</strong> — Mutation rate (0 = freeze loop)",
+            "<strong>Shift + Fader</strong> — Texture macro",
+            "<strong>Button + Fader</strong> — Lévy α",
+            "<strong>Short press</strong> — Reroll pool + expression depth; reset phrase",
+            "<strong>Long press</strong> — Mute (no fader move)",
+            "<strong>Shift + short</strong> — Reverse playback (CV Out: cycle Pitch / Gate / Velocity)",
+            "<strong>Shift + long</strong> — Cycle octave span 1→2→3→4"
+          ]
+        }
+      ]
+    },
+    {
+      "sections": [
+        {
+          "heading": "Expression & LEDs",
+          "items": [
+            "Short press (and CV Dest = Reroll) re-rolls the pool and picks a new <strong>expression depth</strong> for velocity and gate jitter",
+            "<strong>Top LED</strong> — phrase progress (app color); orange for texture; violet for Lévy α",
+            "<strong>Bottom LED</strong> flashes on each hit",
+            "Button LED — octave color; white↔off on reverse; off when muted",
+            "Scenes store the live note pool, phrase length, and expression depth"
+          ]
+        }
+      ]
+    }
+  ],
+  "channels": [
+    {
+      "jackTitle": "Pitch CV Out / CV In",
+      "jackDescription": "Jack mode selects Pitch CV out or CV in (Evolve / Texture / Reroll). MIDI note fires in parallel unless muted.",
+      "faderTitle": "Mutation rate",
+      "faderDescription": "How strongly the note pool Lévy-walks at each phrase boundary. Bottom = frozen loop.",
+      "faderPlusShiftTitle": "Texture",
+      "faderPlusShiftDescription": "One macro for density (rests), phrase length (from 16 steps down to 4), and swing.",
+      "faderPlusFnTitle": "Lévy α",
+      "faderPlusFnDescription": "Flight character — low = local steps, high = wild jumps.",
+      "fnTitle": "Reroll / Mute",
+      "fnDescription": "Short press: new note pool, new expression depth (vel/gate jitter), restart phrase. Long press: mute.",
+      "fnPlusShiftTitle": "Reverse / Octaves",
+      "fnPlusShiftDescription": "Short: reverse playback. Long: cycle octave span 1–4.",
+      "ledTop": "Phrase position (app color)",
+      "ledTopPlusShift": "Texture amount (orange, brighter = denser/shorter)",
+      "ledTopPlusFn": "Lévy α (violet, brighter = wilder)",
+      "ledBottom": "Flash on each hit"
+    }
+  ]
+}

docs/apps/34-arp-de-levy/manual.md

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+Arp de Levy is a one-channel generative arpeggiator with a persistent note pool and Lévy-flight steps — mostly small melodic moves, occasionally a larger jump — so the phrase evolves without white-noise pitch. CV (1V/oct, quantized unless Bypass quantizer) and MIDI note fire together on each hit. V/Oct selects Eurorack 1V/oct or Buchla 1.2V/oct scaling.
+
+Mutation rate freezes the pool at the bottom and applies more Lévy edits at each phrase boundary as you raise it. Texture jointly moves density, phrase length (16 steps down to 4), and swing. Button + Fader sets Lévy α (local ↔ wild jumps). Short press (and CV Dest = Reroll) re-rolls the pool and picks a new expression depth for velocity and gate jitter. Long press mutes. Shift + short reverses playback (on CV Out, cycles Pitch / Gate / Velocity). Shift + long cycles octave span 1–4.
+
+Needs clock. Jack selects CV Out or CV In (Evolve, Texture, Reroll). Follow device tonic transposes the pool with the global Tonic fader.