feat: harden test and registry evidence

schemas/artifacts/registry-snapshot.schema.json

@@ -4,24 +4,49 @@
   "required": [
     "schemaVersion",
     "generatedAt",
-    "compatibilityImpact",
+    "baselineDigest",
+    "currentDigest",
+    "compatibility",
     "failures",
     "registries"
   ],
   "properties": {
-    "schemaVersion": { "const": 1 },
+    "schemaVersion": { "const": 2 },
     "generatedAt": { "type": "string", "format": "date-time" },
-    "compatibilityImpact": {
-      "enum": ["none", "additive", "behavior-change", "breaking"]
+    "baselineDigest": {
+      "type": "string",
+      "pattern": "^[a-f0-9]{64}$"
+    },
+    "currentDigest": {
+      "type": "string",
+      "pattern": "^[a-f0-9]{64}$"
+    },
+    "compatibility": {
+      "type": "object",
+      "required": ["impact", "changes"],
+      "properties": {
+        "impact": {
+          "enum": ["none", "additive", "behavior-change", "breaking"]
+        },
+        "changes": { "type": "array" }
+      },
+      "additionalProperties": false
     },
     "failures": { "type": "array", "maxItems": 0 },
     "registries": {
       "type": "array",
-      "minItems": 8,
-      "maxItems": 8,
+      "minItems": 10,
+      "maxItems": 10,
       "items": {
         "type": "object",
-        "required": ["registryId", "owner", "source", "rowCount", "rows"]
+        "required": [
+          "registryId",
+          "owner",
+          "source",
+          "rowCount",
+          "contract",
+          "rows"
+        ]
       }
     }
   },