feat: Implement senior audio injection with 5 fallback methods

- Add _cmd_create_arrangement_audio_pattern with 5-method fallback chain
- Method 1: track.insert_arrangement_clip() [Live 12+]
- Method 2: track.create_audio_clip() [Live 11+]
- Method 3: arrangement_clips.add_new_clip() [Live 12+]
- Method 4: Session->duplicate_clip_to_arrangement [Legacy]
- Method 5: Session->Recording [Universal]

- Add _cmd_duplicate_clip_to_arrangement for session-to-arrangement workflow
- Update skills documentation
- Verified: 3 clips created at positions [0, 4, 8] in Arrangement View

Closes: Audio injection in Arrangement View

senior_validation_report.json

@@ -0,0 +1,54 @@
+{
+  "timestamp": "2026-04-11T22:08:23.438874",
+  "summary": {
+    "total": 8,
+    "passed": 8,
+    "failed": 0,
+    "errors": 0,
+    "success_rate": 1.0
+  },
+  "results": [
+    {
+      "name": "Module Imports",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.347107"
+    },
+    {
+      "name": "SQLite Database",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.347343"
+    },
+    {
+      "name": "Metadata Store",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.417534"
+    },
+    {
+      "name": "Numpy Independence",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.418406"
+    },
+    {
+      "name": "ArrangementRecorder",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.418516"
+    },
+    {
+      "name": "LiveBridge",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.418578"
+    },
+    {
+      "name": "Integration",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.418632"
+    },
+    {
+      "name": "Ableton Connection",
+      "status": "PASS",
+      "timestamp": "2026-04-11T22:08:23.438859"
+    }
+  ],
+  "warnings": [],
+  "errors": []
+}