fix(ci): update integration test MessageRequest initializers for new tuning fields

openai_compat_integration.rs and client_integration.rs had MessageRequest
constructions without the new tuning param fields (temperature, top_p,
frequency_penalty, presence_penalty, stop) added in c667d47.

Added ..Default::default() to all 4 sites. cargo fmt applied.

This was the root cause of CI red on main (E0063 compile error in
integration tests, not caught by --lib tests).

rust/crates/api/tests/client_integration.rs

@@ -127,6 +127,7 @@ async fn send_message_blocks_oversized_requests_before_the_http_call() {
             tools: None,
             tool_choice: None,
             stream: false,
+            ..Default::default()
         })
         .await
         .expect_err("oversized request should fail local context-window preflight");
@@ -741,6 +742,7 @@ async fn live_stream_smoke_test() {
             tools: None,
             tool_choice: None,
             stream: false,
+            ..Default::default()
         })
         .await
         .expect("live stream should start");
@@ -921,5 +923,6 @@ fn sample_request(stream: bool) -> MessageRequest {
         }]),
         tool_choice: Some(ToolChoice::Auto),
         stream,
+        ..Default::default()
     }
 }

rust/crates/api/tests/openai_compat_integration.rs

@@ -88,6 +88,7 @@ async fn send_message_blocks_oversized_xai_requests_before_the_http_call() {
             tools: None,
             tool_choice: None,
             stream: false,
+            ..Default::default()
         })
         .await
         .expect_err("oversized request should fail local context-window preflight");
@@ -496,6 +497,7 @@ fn sample_request(stream: bool) -> MessageRequest {
         }]),
         tool_choice: Some(ToolChoice::Auto),
         stream,
+        ..Default::default()
     }
 }