fix(mcp): change mcpCheckInput default operation from query to execute (#104)

* fix(mcp): change mcpCheckInput default operation from query to execute

Follows axonflow-enterprise#1288. The check-input endpoint is called by
external orchestrators managing their own MCP execution, so defaulting to
"execute" (conservative) is semantically correct over "query" (read-only).

* fix(test): update default operation assertion from query to execute

---------

Co-authored-by: Saurabh Jain <saurabhjain1592@gmail.com>

Author: gzak

src/main/java/com/getaxonflow/sdk/AxonFlow.java

@@ -1504,7 +1504,7 @@ public MCPCheckInputResponse mcpCheckInput(String connectorType, String statemen
         return retryExecutor.execute(() -> {
             MCPCheckInputRequest request;
             if (options != null) {
-                String operation = (String) options.getOrDefault("operation", "query");
+                String operation = (String) options.getOrDefault("operation", "execute");
                 @SuppressWarnings("unchecked")
                 Map<String, Object> parameters = (Map<String, Object>) options.get("parameters");
                 request = new MCPCheckInputRequest(connectorType, statement, parameters, operation);

src/main/java/com/getaxonflow/sdk/types/MCPCheckInputRequest.java

@@ -44,13 +44,13 @@ public final class MCPCheckInputRequest {
 
     /**
      * Creates a request with connector type and statement only.
-     * Operation defaults to "query".
+     * Operation defaults to "execute".
      *
      * @param connectorType the MCP connector type (e.g., "postgres")
      * @param statement     the statement to validate
      */
     public MCPCheckInputRequest(String connectorType, String statement) {
-        this(connectorType, statement, null, "query");
+        this(connectorType, statement, null, "execute");
     }
 
     /**

src/test/java/com/getaxonflow/sdk/types/MoreTypesTest.java

@@ -1527,7 +1527,7 @@ void shouldCreateWithBasicFields() {
 
             assertThat(request.getConnectorType()).isEqualTo("postgres");
             assertThat(request.getStatement()).isEqualTo("SELECT * FROM users");
-            assertThat(request.getOperation()).isEqualTo("query");
+            assertThat(request.getOperation()).isEqualTo("execute");
             assertThat(request.getParameters()).isNull();
         }