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/doc-sync-scan.schema.json

@@ -0,0 +1,38 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "Doc Sync Scan Results",
+  "description": "Documentation inconsistency scan for doc-sync pipeline",
+  "type": "object",
+  "required": ["scan_scope", "findings", "summary", "timestamp"],
+  "properties": {
+    "scan_scope": { "type": "string", "minLength": 1 },
+    "findings": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": ["id", "type", "severity", "title", "description"],
+        "properties": {
+          "id": { "type": "string", "pattern": "^DOC-[0-9]{3}$" },
+          "type": { "type": "string", "enum": ["MISSING_DOCS", "STALE_DOCS", "INACCURATE", "INCOMPLETE"] },
+          "severity": { "type": "string", "enum": ["CRITICAL", "HIGH", "MEDIUM", "LOW"] },
+          "title": { "type": "string", "minLength": 3 },
+          "doc_location": { "type": "string" },
+          "code_location": { "type": "string" },
+          "description": { "type": "string", "minLength": 10 },
+          "suggested_fix": { "type": "string" }
+        }
+      }
+    },
+    "summary": {
+      "type": "object",
+      "required": ["total_findings"],
+      "properties": {
+        "total_findings": { "type": "integer", "minimum": 0 },
+        "by_type": { "type": "object" },
+        "by_severity": { "type": "object" },
+        "fixable_count": { "type": "integer", "minimum": 0 }
+      }
+    },
+    "timestamp": { "type": "string", "format": "date-time" }
+  }
+}