fix(mcp-server): add graceful shutdown to prevent zombie processes (#477)

* fix(mcp-server): add graceful shutdown to prevent zombie processes

Add lifecycle handlers to properly exit the MCP server when the parent
application closes:

- Listen for stdin close/end events (primary method for all platforms)
- Handle SIGINT/SIGTERM signals
- Handle stdout broken pipe errors
- Export shutdown() function from http-server to clean up resources

* chore(mcp-server): bump version to 0.1.11

packages/mcp-server/src/http-server.ts

@@ -127,7 +127,12 @@ function cleanupExpiredSessions(): void {
     }
 }
 
-setInterval(cleanupExpiredSessions, 5 * 60 * 1000)
+const cleanupIntervalId = setInterval(cleanupExpiredSessions, 5 * 60 * 1000)
+
+export function shutdown(): void {
+    clearInterval(cleanupIntervalId)
+    stopHttpServer()
+}
 
 export function getServerPort(): number {
     return serverPort