feat: implement MACP phase 1 core protocol

tools/orchestrator-matrix/protocol/result.schema.json

@@ -0,0 +1,119 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://mosaicstack.dev/schemas/orchestrator/result.schema.json",
+  "title": "MACP Task Result",
+  "type": "object",
+  "required": [
+    "task_id",
+    "status",
+    "completed_at"
+  ],
+  "properties": {
+    "task_id": {
+      "type": "string"
+    },
+    "status": {
+      "type": "string",
+      "enum": [
+        "completed",
+        "failed",
+        "escalated"
+      ]
+    },
+    "completed_at": {
+      "type": "string",
+      "format": "date-time"
+    },
+    "failed_at": {
+      "type": [
+        "string",
+        "null"
+      ],
+      "format": "date-time"
+    },
+    "exit_code": {
+      "type": [
+        "integer",
+        "null"
+      ]
+    },
+    "attempt": {
+      "type": "integer"
+    },
+    "max_attempts": {
+      "type": "integer"
+    },
+    "runtime": {
+      "type": "string"
+    },
+    "dispatch": {
+      "type": "string"
+    },
+    "worktree": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "branch": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "pr": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "summary": {
+      "type": "string",
+      "description": "Human-readable summary of what the worker did"
+    },
+    "files_changed": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      }
+    },
+    "gate_results": {
+      "type": "array",
+      "items": {
+        "type": "object",
+        "properties": {
+          "command": {
+            "type": "string"
+          },
+          "exit_code": {
+            "type": "integer"
+          },
+          "type": {
+            "type": "string",
+            "enum": [
+              "mechanical",
+              "ai-review",
+              "ci-pipeline"
+            ]
+          }
+        }
+      }
+    },
+    "error": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "escalation_reason": {
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "metadata": {
+      "type": "object"
+    }
+  },
+  "additionalProperties": true
+}