Refactor subagent and workflow domain models; migrate access tiers and events to domain module

- Moved `AccessTier` and `SubagentEvent` enums to `zesdex_domain::subagent`.
- Consolidated workflow-related types into `zesdex_domain::workflow`.
- Updated references across the codebase to use the new domain models.
- Refactored tool execution logic to utilize a new `ToolExecutor` trait.
- Enhanced `AgentTurnService` to handle tool calls and events more effectively.
- Adjusted API handlers and state management to align with new domain structure.

apps/infrastructure/src/tools/parallel_delegate.rs

@@ -200,7 +200,8 @@ impl Tool for ParallelDelegate {
 
         // Consolidate results
         if synthesize && results.len() > 1 {
-            let consolidated = consolidate_results(&results, &base_url, &api_key, &model)?;
+            let rt = tokio::runtime::Runtime::new()?;
+            let consolidated = rt.block_on(consolidate_results(&results, &base_url, &api_key, &model))?;
             Ok(format!(
                 "## Parallel Delegation Complete\n\n**Task:** {task}\n**Parallel agents:** {}\n\n{}",
                 results.len(),
@@ -249,8 +250,9 @@ async fn auto_split_task(
     let user_msg =
         zesdex_domain::core::ChatMessage::user(format!("Task: {task}\n\nSplit into {max_parallel} parallel directives:"));
 
+    use zesdex_application::ports::ProviderService;
     match client
-        .chat_with_tools_non_streaming(&[sys_msg, user_msg], None, Some(2048), Some(0.4), None)
+        .chat(&[sys_msg, user_msg], None, Some(2048), Some(0.4)).await
     {
         Ok((response, _)) => {
             let text = response.content.unwrap_or_default();
@@ -339,7 +341,7 @@ fn fallback_split(task: &str, max_parallel: usize) -> Vec<(String, AccessTier)>
 }
 
 /// Use LLM to consolidate multiple agent results into a single response.
-fn consolidate_results(
+async fn consolidate_results(
     results: &[(usize, String, String)],
     base_url: &str,
     api_key: &str,
@@ -367,7 +369,8 @@ fn consolidate_results(
         "Consolidate the following parallel agent outputs:\n\n{summary}"
     ));
 
-    match client.chat_with_tools_non_streaming(&[sys_msg, user_msg], None, Some(2048), Some(0.3), None) {
+    use zesdex_application::ports::ProviderService;
+    match client.chat(&[sys_msg, user_msg], None, Some(2048), Some(0.3)).await {
         Ok((response, _)) => Ok(response.content.unwrap_or_else(|| summary.clone())),
         Err(e) => {
             warn!(error = %e, "consolidation LLM call failed, using raw concatenation");