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/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();
+        }
+    }
+}