Add signed service manifest contract

examples/service-manifest.json

@@ -0,0 +1,60 @@
+{
+  "payload": {
+    "api": {
+      "contract": "amp.example.customer-api",
+      "schema_sha256": "1111111111111111111111111111111111111111111111111111111111111111",
+      "version": "1.0.0"
+    },
+    "expires_at": "2036-01-01T00:00:00Z",
+    "issued_at": "2026-01-01T00:00:00Z",
+    "name": "AMP Service Manifest Golden Fixture",
+    "root_public_key": "f9308a019258c31049344f85f89d5229b531c845836f99b08601f113bce036f9",
+    "routes": [
+      {
+        "auth": [
+          "nip98"
+        ],
+        "capabilities": [
+          "catalog.read",
+          "job.submit",
+          "job.status"
+        ],
+        "context": "clearnet",
+        "endpoint": "https://ampgateway.site/",
+        "interaction_tier": "transactional",
+        "payments": [
+          "server-invoice"
+        ],
+        "priority": 10,
+        "transport": "clearnet"
+      },
+      {
+        "auth": [
+          "nip98"
+        ],
+        "capabilities": [
+          "catalog.read",
+          "job.submit",
+          "job.status"
+        ],
+        "context": "tor",
+        "endpoint": "http://fy2zosxp4oqqcacxcegvwshtmsiiyztnwoinbm46yoig4o3kveidotyd.onion/",
+        "interaction_tier": "transactional",
+        "payments": [
+          "server-invoice"
+        ],
+        "priority": 20,
+        "transport": "tor"
+      }
+    ],
+    "sequence": 1,
+    "service_id": "amp:5603a5186ef45121612a9b5ff37ae53b81000881d864df7f367aeba037c0e346"
+  },
+  "schema": "amp.service-manifest.v1",
+  "signature": {
+    "algorithm": "BIP340-secp256k1",
+    "canonicalization": "RFC8785-JCS",
+    "public_key": "f9308a019258c31049344f85f89d5229b531c845836f99b08601f113bce036f9",
+    "value": "0c0edc3bc02c3697f7bffd9bd6c03558b400c586ef0d8daf48e8486d387aae5aee1e17a5243514e4254a534574d34362224df73a99f332e1747a648eb44c42b9"
+  }
+}