feat(tui): add usage overlay and sidebar for displaying usage statistics and tasks

feat(tui): implement status bar with connection and turn state indicators
feat(tui): create workflow panel for agent status and progress visualization
feat(web): introduce web frontend interface with static file serving
feat(ws): add WebSocket interface for real-time communication and session management

apps/infrastructure/src/mcp/manager.rs

@@ -0,0 +1,51 @@
+//! Manages MCP server connections — start, stop, list, and dispatch
+//! tool calls to remote MCP servers.
+
+use std::collections::HashMap;
+
+/// Metadata for a connected MCP server.
+#[derive(Debug, Clone)]
+pub struct McpServerHandle {
+    pub name: String,
+    pub transport: String,
+}
+
+/// Manages MCP server connections.
+#[derive(Clone)]
+pub struct McpManager {
+    servers: HashMap<String, McpServerHandle>,
+}
+
+impl McpManager {
+    pub fn new() -> Self {
+        McpManager {
+            servers: HashMap::new(),
+        }
+    }
+
+    pub fn register(&mut self, name: &str, transport: &str) {
+        self.servers.insert(
+            name.to_string(),
+            McpServerHandle {
+                name: name.to_string(),
+                transport: transport.to_string(),
+            },
+        );
+    }
+
+    pub fn unregister(&mut self, name: &str) {
+        self.servers.remove(name);
+    }
+
+    pub fn list(&self) -> Vec<McpServerHandle> {
+        self.servers.values().cloned().collect()
+    }
+
+    pub fn get(&self, name: &str) -> Option<&McpServerHandle> {
+        self.servers.get(name)
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.servers.is_empty()
+    }
+}

apps/infrastructure/src/mcp/mod.rs

@@ -0,0 +1,5 @@
+//! Model Context Protocol (MCP) — bridge between agent tools and external MCP
+//! servers using the rmcp crate.
+
+pub mod manager;
+pub mod transport;

apps/infrastructure/src/mcp/transport.rs

@@ -0,0 +1,40 @@
+//! MCP transport layer — manages child-process and HTTP-based transport
+//! for connecting to MCP servers.
+
+use std::process::{Child, Command, Stdio};
+
+/// A running MCP server process connected via stdio.
+pub struct McpTransport {
+    process: Option<Child>,
+}
+
+impl McpTransport {
+    pub fn start_child_process(command: &str, args: &[String]) -> anyhow::Result<Self> {
+        let child = Command::new(command)
+            .args(args)
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::inherit())
+            .spawn()?;
+        Ok(McpTransport {
+            process: Some(child),
+        })
+    }
+
+    pub fn stop(&mut self) -> anyhow::Result<()> {
+        if let Some(mut child) = self.process.take() {
+            let _ = child.kill();
+            let _ = child.wait();
+        }
+        Ok(())
+    }
+}
+
+impl Drop for McpTransport {
+    fn drop(&mut self) {
+        if let Some(mut child) = self.process.take() {
+            let _ = child.kill();
+            let _ = child.wait();
+        }
+    }
+}