feat: add artifact schema registry

docs/schemas/artifacts/common/final-report@1.json

@@ -0,0 +1,73 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "common/final-report@1",
+  "title": "Devflow Final Report",
+  "type": "object",
+  "required": [
+    "runId",
+    "templateHash",
+    "bindings",
+    "inputs",
+    "phases",
+    "approvals",
+    "findings",
+    "commands",
+    "artifacts",
+    "events",
+    "unresolved",
+    "endedAt",
+    "status"
+  ],
+  "properties": {
+    "runId": { "type": "string", "format": "uuid" },
+    "templateHash": { "type": "string", "pattern": "^[a-f0-9]{64}$" },
+    "bindings": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": ["roleId", "personaHash", "backend"],
+        "properties": {
+          "roleId": { "type": "string", "minLength": 1 },
+          "personaHash": { "type": "string", "pattern": "^[a-f0-9]{64}$" },
+          "backend": { "type": "string", "enum": ["codex", "claude", "fake"] }
+        }
+      }
+    },
+    "inputs": { "type": "object" },
+    "phases": { "type": "array" },
+    "approvals": { "type": "array" },
+    "findings": { "type": "array" },
+    "commands": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "required": ["kind", "argv", "exit_code"],
+        "properties": {
+          "kind": { "type": "string", "minLength": 1 },
+          "argv": {
+            "type": "array",
+            "items": { "type": "string" }
+          },
+          "exit_code": { "type": ["integer", "null"] }
+        }
+      }
+    },
+    "artifacts": { "type": "array" },
+    "events": {
+      "type": "object",
+      "required": ["tail"],
+      "properties": {
+        "tail": {
+          "type": "array",
+          "maxItems": 200
+        }
+      }
+    },
+    "unresolved": { "type": "array" },
+    "endedAt": { "type": "string", "format": "utc-date-time" },
+    "status": {
+      "type": "string",
+      "enum": ["completed", "failed", "aborted"]
+    }
+  }
+}