Remove hardcoded DNS — keep host resolv.conf in rootfs

Don't overwrite the host's resolv.conf with hardcoded 8.8.8.8.
The host's DNS config is already correct for both build and runtime.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/install.sh

@@ -304,8 +304,6 @@ else
         echo "[storage]" > /etc/containers/storage.conf
         echo "driver = \"vfs\"" >> /etc/containers/storage.conf
     ' || err "Failed to install packages in chroot"
-    # Set static DNS for runtime
-    echo "nameserver 8.8.8.8" | sudo tee /tmp/agent-build-mnt/etc/resolv.conf > /dev/null
     ok "Alpine packages installed"
 
     log "Installing agent script and config..."