feat(audio): complete phase 3c slice 3 automation

exhibits/minimal-audio.xzbt

@@ -3,9 +3,9 @@
   "meta": {
     "id": "minimal-audio",
     "name": "Minimal Audio",
-    "version": "1.0.0",
+    "version": "1.1.0",
     "author": "XZBT",
-    "description": "A minimal generic exhibit exercising the Phase 3 audio graph, component, routing, and bus contracts.",
+    "description": "A minimal generic exhibit exercising audio graphs, components, routing, buses, and the Phase 3c automation modes and curves.",
     "license": "CC0-1.0",
     "tags": ["minimal", "audio"]
   },
@@ -45,6 +45,11 @@
           { "from": "tone", "to": "shape" },
           { "from": "shape", "to": "level" },
           { "from": "level", "to": "output" }
+        ],
+        "automation": [
+          { "target": "shape.frequency", "interpolation": "exponential", "points": [
+            { "at": "0s", "value": 1800 }, { "at": "12s", "value": 800 }
+          ] }
         ]
       }
     }
@@ -74,6 +79,14 @@
           { "from": "trim", "to": "output" },
           { "from": "wobble", "to": "low.pitch", "depth": 1.5 },
           { "from": "wander", "to": "high.pitch", "depth": 1 }
+        ],
+        "automation": [
+          { "target": "low.pitch", "mode": "offset", "interpolation": "smooth", "points": [
+            { "at": "0s", "value": 0 }, { "at": "6s", "value": 12 }, { "at": "18s", "value": -4 }
+          ] },
+          { "target": "high.level", "mode": "scale", "points": [
+            { "at": "0s", "value": 0.4 }, { "at": "3s", "value": 1 }
+          ] }
         ]
       }
     }
@@ -113,6 +126,11 @@
           { "from": "body", "to": "place" },
           { "from": "place", "to": "trim" },
           { "from": "trim", "to": "output" }
+        ],
+        "automation": [
+          { "target": "place.pan", "interpolation": "step", "points": [
+            { "at": "0ms", "value": -0.2 }, { "at": "120ms", "value": 0.2 }
+          ] }
         ]
       }
     }