Add GPT-6.1 Terra to model catalogs (#57293)

## What changed

- Add `gpt-6.1-terra` to the bundled catalog and GCP Vertex model picker.
- Add `openai.gpt-6.1-terra` to Amazon Bedrock catalogs, including Global and US cross-region runtime variants.
- Use `gpt-6.1-terra` as GCP's preferred memory consolidation model.

## Testing

Extend catalog, model picker, thread startup, and Vertex request tests to cover GPT-6.1 Terra.

GitOrigin-RevId: edb3be3c4286c191349cdee742005ed3c67029e8

codex-rs/core/tests/suite/gcp.rs

@@ -94,8 +94,12 @@ async fn vertex_credential_file_is_retained_when_refreshing_after_401() -> Resul
     Ok(())
 }
 
+#[test_case("gpt-6.1-sol"; "sol")]
+#[test_case("gpt-6.1-terra"; "terra")]
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-async fn vertex_requests_use_command_auth_with_namespaces_and_tool_search() -> Result<()> {
+async fn vertex_requests_use_command_auth_with_namespaces_and_tool_search(
+    model: &str,
+) -> Result<()> {
     skip_if_no_network!(Ok(()));
 
     let server = responses::start_mock_server().await;
@@ -116,13 +120,14 @@ async fn vertex_requests_use_command_auth_with_namespaces_and_tool_search() -> R
     provider.auth = Some(auth_fixture.auth());
 
     let mut test = test_codex()
-        .with_model_info_override("gpt-6.1-sol", |model| {
+        .with_model_info_override(model, |model| {
             model.use_responses_lite = true;
             model.tool_mode = Some(ToolMode::CodeModeOnly);
             model.apply_patch_tool_type = Some(ApplyPatchToolType::Freeform);
             model.supports_search_tool = true;
             model.multi_agent_version = Some(MultiAgentVersion::V2);
         })
+        .with_model(model)
         .with_config(move |config| {
             config.model_provider_id = GCP_PROVIDER_ID.to_string();
             config.model_provider = provider;
@@ -183,7 +188,7 @@ async fn vertex_requests_use_command_auth_with_namespaces_and_tool_search() -> R
         "Vertex request must omit Responses Lite additional_tools inputs"
     );
     let body = request.body_json();
-    assert_eq!(body["model"], "gpt-6.1-sol");
+    assert_eq!(body["model"], model);
     assert_eq!(request.instructions_text(), "Vertex test instructions");
     let tools = body["tools"]
         .as_array()

codex-rs/core/tests/suite/snapshots/all__suite__gcp__gcp_model_picker.snap

@@ -18,4 +18,9 @@ expression: "models.iter().map(|model|\n(&model.model, model.show_in_picker, mod
         true,
         false,
     ),
+    (
+        "gpt-6.1-terra",
+        true,
+        false,
+    ),
 ]