refactor(core): remove provider module, migrate to LLMProvider, add client mode handling, improve serialization error handling, update workspace edition, and clean up conditionals and imports

crates/owlen-core/src/agent.rs

@@ -3,8 +3,8 @@
 //! This module provides the core agent orchestration logic that allows an LLM
 //! to reason about tasks, execute tools, and observe results in an iterative loop.
 
+use crate::Provider;
 use crate::mcp::{McpClient, McpToolCall, McpToolDescriptor, McpToolResponse};
-use crate::provider::Provider;
 use crate::types::{ChatParameters, ChatRequest, Message};
 use crate::{Error, Result};
 use serde::{Deserialize, Serialize};
@@ -189,7 +189,7 @@ impl AgentExecutor {
     fn build_system_prompt(&self, tools: &[McpToolDescriptor]) -> String {
         let mut prompt = String::from(
             "You are an AI assistant that uses the ReAct (Reasoning and Acting) pattern to solve tasks.\n\n\
-            You have access to the following tools:\n\n"
+            You have access to the following tools:\n\n",
         );
 
         for tool in tools {
@@ -230,7 +230,7 @@ impl AgentExecutor {
             tools: None,
         };
 
-        let response = self.llm_client.chat(request).await?;
+        let response = self.llm_client.send_prompt(request).await?;
         Ok(response.message.content)
     }
 
@@ -364,13 +364,13 @@ impl AgentExecutor {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::llm::test_utils::MockProvider;
     use crate::mcp::test_utils::MockMcpClient;
-    use crate::provider::test_utils::MockProvider;
 
     #[test]
     fn test_parse_tool_call() {
         let executor = AgentExecutor {
-            llm_client: Arc::new(MockProvider),
+            llm_client: Arc::new(MockProvider::default()),
             tool_client: Arc::new(MockMcpClient),
             config: AgentConfig::default(),
         };
@@ -399,7 +399,7 @@ ACTION_INPUT: {"query": "Rust programming language"}
     #[test]
     fn test_parse_final_answer() {
         let executor = AgentExecutor {
-            llm_client: Arc::new(MockProvider),
+            llm_client: Arc::new(MockProvider::default()),
             tool_client: Arc::new(MockMcpClient),
             config: AgentConfig::default(),
         };