fix: Correct SecurityScheme and Security JSON format in JSONRPC transport test

Fixed the AGENT_CARD test constant to use the correct protobuf JSON format:
- SecurityScheme: Changed from flat structure with "type" discriminator to
  oneof wrapper format with "openIdConnectSecurityScheme" field
- Security: Changed from flat map structure to nested structure with
  "schemes" wrapper and "list" wrapper for scopes

This ensures the JSON matches the protobuf JSON format expected by
JSONRPCUtils.parseJsonString() in the JSONRPC transport layer.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ehsavoie

client/transport/jsonrpc/src/test/java/io/a2a/client/transport/jsonrpc/JsonMessages.java

@@ -30,11 +30,12 @@ public class JsonMessages {
                  },
                  "securitySchemes": {
                    "google": {
-                     "type": "openIdConnect",
-                     "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                     "openIdConnectSecurityScheme": {
+                       "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                     }
                    }
                  },
-                 "security": [{ "google": ["openid", "profile", "email"] }],
+                 "security": [{ "schemes": { "google": { "list": ["openid", "profile", "email"] } } }],
                  "defaultInputModes": ["application/json", "text/plain"],
                  "defaultOutputModes": ["application/json", "image/png"],
                  "skills": [
@@ -102,11 +103,12 @@ public class JsonMessages {
                 },
                 "securitySchemes": {
                   "google": {
-                    "type": "openIdConnect",
-                    "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                    "openIdConnectSecurityScheme": {
+                      "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                    }
                   }
                 },
-                "security": [{ "google": ["openid", "profile", "email"] }],
+               "security": [{ "schemes": { "google": { "list": ["openid", "profile", "email"] } } }],
                 "defaultInputModes": ["application/json", "text/plain"],
                 "defaultOutputModes": ["application/json", "image/png"],
                 "skills": [
@@ -677,11 +679,12 @@ public class JsonMessages {
                     },
                     "securitySchemes": {
                       "google": {
-                        "type": "openIdConnect",
-                        "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                        "openIdConnectSecurityScheme": {
+                          "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                        }
                       }
                     },
-                    "security": [{ "google": ["openid", "profile", "email"] }],
+                    "security": [{ "schemes": { "google": { "list": ["openid", "profile", "email"] } } }],
                     "defaultInputModes": ["application/json", "text/plain"],
                     "defaultOutputModes": ["application/json", "image/png"],
                     "skills": [
@@ -757,11 +760,12 @@ public class JsonMessages {
                 },
                 "securitySchemes": {
                   "google": {
-                    "type": "openIdConnect",
-                    "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                    "openIdConnectSecurityScheme": {
+                      "openIdConnectUrl": "https://accounts.google.com/.well-known/openid-configuration"
+                    }
                   }
                 },
-                "security": [{ "google": ["openid", "profile", "email"] }],
+                "security": [{ "schemes": { "google": { "list": ["openid", "profile", "email"] } } }],
                 "defaultInputModes": ["application/json", "text/plain"],
                 "defaultOutputModes": ["application/json", "image/png"],
                 "skills": [
@@ -800,6 +804,6 @@ public class JsonMessages {
                   }
                 ],
                 "supportsAuthenticatedExtendedCard": true,
-                "protocolVersion": "0.2.5"
+                "protocolVersion": "0.4.0"
               }""";
 }