Client only CI action: And cleant up step

Author: jackctj117

.github/workflows/build-and-test-clientonly.yml

@@ -50,6 +50,17 @@ jobs:
         make clean
         make -j CLIENT_ONLY_TCP=1 SHE=1 ASAN=1 WOLFSSL_DIR=../wolfssl && make run
 
+    # Restart server with fresh state for second test run
+    - name: Restart POSIX server
+      run: |
+        kill $TCP_SERVER_PID || true
+        cd examples/posix/wh_posix_server
+        rm -f *.bin || true
+        ./Build/wh_posix_server.elf &
+        TCP_SERVER_PID=$!
+        echo "TCP_SERVER_PID=$TCP_SERVER_PID" >> $GITHUB_ENV
+        sleep 2
+
     # Build and test client-only with DEBUG_VERBOSE=1 (includes DEBUG)
     - name: Build client-only unit tests with DEBUG_VERBOSE
       run: |