Add Wave contract schemas for pipeline validation

JSON Schema definitions for all pipeline handover contracts
including issue analysis, research, enhancement, and sync flows.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.wave/contracts/validated-findings.schema.json

@@ -0,0 +1,50 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Validated Findings",
+  "description": "Convergent validation results from the recinq converge step",
+  "type": "object",
+  "required": ["target", "total_findings", "confirmed", "rejected", "findings"],
+  "properties": {
+    "target": {
+      "type": "string",
+      "description": "What was analyzed (path, module, or 'whole-project')"
+    },
+    "total_findings": {
+      "type": "integer",
+      "description": "Total number of divergent findings reviewed"
+    },
+    "confirmed": {
+      "type": "integer",
+      "description": "Number of findings classified as CONFIRMED or PARTIALLY_CONFIRMED"
+    },
+    "rejected": {
+      "type": "integer",
+      "description": "Number of findings classified as REJECTED"
+    },
+    "findings": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": ["id", "status", "rationale"],
+        "properties": {
+          "id": {
+            "type": "string",
+            "description": "Original finding ID (e.g. DVG-001)"
+          },
+          "status": {
+            "type": "string",
+            "enum": ["CONFIRMED", "PARTIALLY_CONFIRMED", "REJECTED"],
+            "description": "Validation classification"
+          },
+          "rationale": {
+            "type": "string",
+            "description": "Explanation of why the finding was classified this way"
+          }
+        },
+        "additionalProperties": true
+      },
+      "description": "Per-finding validation results"
+    }
+  },
+  "additionalProperties": true
+}