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/github-issue-analysis.schema.json

@@ -0,0 +1,86 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "title": "GitHub Issue Analysis",
+  "description": "Schema for GitHub issue quality analysis results",
+  "type": "object",
+  "required": ["repository", "total_issues", "poor_quality_issues"],
+  "properties": {
+    "repository": {
+      "type": "object",
+      "required": ["owner", "name"],
+      "properties": {
+        "owner": {
+          "type": "string",
+          "minLength": 1
+        },
+        "name": {
+          "type": "string",
+          "minLength": 1
+        }
+      }
+    },
+    "total_issues": {
+      "type": "integer",
+      "minimum": 0
+    },
+    "analyzed_count": {
+      "type": "integer",
+      "minimum": 0
+    },
+    "poor_quality_issues": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": ["number", "title", "quality_score", "problems"],
+        "properties": {
+          "number": {
+            "type": "integer",
+            "minimum": 1
+          },
+          "title": {
+            "type": "string"
+          },
+          "body": {
+            "type": "string"
+          },
+          "quality_score": {
+            "type": "integer",
+            "minimum": 0,
+            "maximum": 100
+          },
+          "problems": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          },
+          "recommendations": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          },
+          "labels": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            }
+          },
+          "url": {
+            "type": "string",
+            "format": "uri"
+          }
+        }
+      }
+    },
+    "quality_threshold": {
+      "type": "integer",
+      "minimum": 0,
+      "maximum": 100
+    },
+    "timestamp": {
+      "type": "string",
+      "format": "date-time"
+    }
+  }
+}