Add producer-owned authenticated Go decision client and validated Forgejo profile

Assistant: codex
Assistant-Model: gpt-6.1-sol
Assistant-Session: 01a14bfc-9643-7872-aa12-98326dcf25e7

examples/forgejo-application-access/registry_snapshot.json

@@ -0,0 +1,38 @@
+{
+  "systems": [
+    {
+      "id": "forgejo",
+      "name": "Synthetic test only",
+      "resource_types": [
+        {
+          "name": "application"
+        }
+      ],
+      "actions": [
+        {
+          "name": "application.access"
+        }
+      ]
+    }
+  ],
+  "subjects": [],
+  "resource_manifests": [
+    {
+      "id": "forgejo.synthetic.resources",
+      "system": "forgejo",
+      "resources": [
+        {
+          "id": "application:forgejo",
+          "type": "application",
+          "attributes": {
+            "identity_issuer": "https://issuer.invalid",
+            "tenant": "tenant:synthetic"
+          }
+        }
+      ],
+      "actions": [
+        "application.access"
+      ]
+    }
+  ]
+}