feat(fxt): wire MCP server to real gRPC calls

All 32 MCP tool handlers now make real gRPC calls to the API Gateway
instead of returning stub responses. Covers: service monitoring,
training management, trading operations, ML inference, risk metrics,
broker status, data acquisition, cluster resources, agent control,
config management, and hyperopt tuning.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bin/fxt/src/commands/mcp.rs

@@ -6,6 +6,7 @@
 use anyhow::Result;
 use clap::Parser;
 
+use crate::grpc::FoxhuntClient;
 use crate::mcp::server::McpServer;
 
 /// Start MCP server (JSON-RPC 2.0 on stdin/stdout)
@@ -24,7 +25,8 @@ impl McpCommand {
     /// Start the MCP server that exposes Foxhunt operations as tools
     /// for LLM agents (e.g. Claude, Cursor).
     pub async fn execute(&self) -> Result<()> {
-        let server = McpServer::new(self.api_url.clone());
+        let client = FoxhuntClient::connect(&self.api_url).await?;
+        let server = McpServer::new(self.api_url.clone(), client);
         server.run().await
     }
 }