feat: introduce Rig agent runtime migration

app/src/ai/runtime/rig_tests.rs

@@ -0,0 +1,59 @@
+use galaxy_agent_core::StopReason;
+use warp_multi_agent_api::response_event::stream_finished;
+
+use super::{build_add_reasoning, build_append_reasoning, map_stop_reason, saturating_i32};
+
+#[test]
+fn stop_reasons_map_to_the_existing_ui_contract() {
+    assert!(matches!(
+        map_stop_reason(StopReason::Completed),
+        stream_finished::Reason::Done(_)
+    ));
+    assert!(matches!(
+        map_stop_reason(StopReason::MaxTokens),
+        stream_finished::Reason::MaxTokenLimit(_)
+    ));
+    assert!(matches!(
+        map_stop_reason(StopReason::Cancelled),
+        stream_finished::Reason::Other(_)
+    ));
+}
+
+#[test]
+fn token_counts_saturate_at_the_proto_limit() {
+    assert_eq!(saturating_i32(u64::MAX), i32::MAX);
+}
+
+#[test]
+fn reasoning_events_match_the_existing_ui_message_contract() {
+    let add = build_add_reasoning("task", "message", "think");
+    let append = build_append_reasoning("task", "message", " more");
+
+    let Some(warp_multi_agent_api::response_event::Type::ClientActions(add)) = add.r#type else {
+        panic!("expected client actions");
+    };
+    let Some(warp_multi_agent_api::client_action::Action::AddMessagesToTask(add)) =
+        &add.actions[0].action
+    else {
+        panic!("expected add-message action");
+    };
+    assert!(matches!(
+        add.messages[0].message.as_ref(),
+        Some(warp_multi_agent_api::message::Message::AgentReasoning(reasoning))
+            if reasoning.reasoning == "think"
+    ));
+
+    let Some(warp_multi_agent_api::response_event::Type::ClientActions(append)) = append.r#type
+    else {
+        panic!("expected client actions");
+    };
+    let Some(warp_multi_agent_api::client_action::Action::AppendToMessageContent(append)) =
+        &append.actions[0].action
+    else {
+        panic!("expected append-message action");
+    };
+    assert_eq!(
+        append.mask.as_ref().unwrap().paths,
+        ["agent_reasoning.reasoning"]
+    );
+}