Update shutdown commands to use lsof -ti for consistency

AGENTS.md

@@ -182,7 +182,7 @@ curl -s http://localhost:8080/api/health
 To stop the server gracefully:
 ```bash
 # Send SIGTERM for graceful shutdown
-pkill -TERM -f "go run"
+kill -TERM $(lsof -ti :8080)
 
 # Or send SIGINT (Ctrl+C equivalent)
 pkill -INT -f "go run"
@@ -198,7 +198,7 @@ pkill -INT -f "go run"
 
 For force stop (if graceful shutdown hangs):
 ```bash
-pkill -f "go"
+kill -9 $(lsof -ti :8080)
 ```
 
 **Verification:**
@@ -411,11 +411,8 @@ router.Route("/api/v1", func(r chi.Router) {
 
 ### Port Already in Use
 ```bash
-# Find process using port 8080
-lsof -i :8080
-
-# Kill the process
-kill -9 <PID>
+# Find and kill process using port 8080
+kill -TERM $(lsof -ti :8080)
 ```
 
 ### Server Not Responding