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/mcp/client.rs

@@ -1,5 +1,5 @@
 use super::{McpToolCall, McpToolDescriptor, McpToolResponse};
-use crate::Result;
+use crate::{Result, mode::Mode};
 use async_trait::async_trait;
 
 /// Trait for a client that can interact with an MCP server
@@ -10,6 +10,11 @@ pub trait McpClient: Send + Sync {
 
     /// Call a tool on the server
     async fn call_tool(&self, call: McpToolCall) -> Result<McpToolResponse>;
+
+    /// Update the server with the active operating mode.
+    async fn set_mode(&self, _mode: Mode) -> Result<()> {
+        Ok(())
+    }
 }
 
 // Re-export the concrete implementation that supports stdio and HTTP transports.