feat(phase0): complete shared contracts and milestone plan

schema/xzbt-0.1.schema.json

@@ -299,26 +299,43 @@
     "BindingSpec": {
       "type": "object",
       "required": [
-        "from",
-        "to"
+        "source",
+        "target"
       ],
       "additionalProperties": false,
       "properties": {
-        "from": {
+        "source": {
           "type": "string",
           "description": "Source reference path (e.g. 'parameters.activity')."
         },
-        "to": {
+        "target": {
           "type": "string",
           "description": "Target reference path (e.g. 'audio.buses.ambient.gain')."
         },
-        "transform": {
-          "$ref": "#/definitions/ValueSpec",
-          "description": "Optional transformation ValueSpec."
+        "scale": {
+          "type": "number",
+          "description": "Numeric source multiplier. Defaults to 1."
+        },
+        "offset": {
+          "type": "number",
+          "description": "Numeric offset applied after scaling. Defaults to 0."
+        },
+        "clamp": {
+          "type": "array",
+          "minItems": 2,
+          "maxItems": 2,
+          "items": {
+            "type": "number"
+          },
+          "description": "Inclusive [minimum, maximum] clamp applied to the transformed binding value."
         },
         "smoothing": {
           "$ref": "#/definitions/DurationSpec",
           "description": "Optional smoothing low-pass duration."
+        },
+        "when": {
+          "$ref": "#/definitions/ConditionSpec",
+          "description": "Optional condition; defaults to true."
         }
       }
     },