Fix DNS in install script chroot

Copy host /etc/resolv.conf into chroot before apk install.
Set static nameserver after install for runtime.

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

scripts/install.sh

@@ -280,6 +280,9 @@ else
     mkdir -p /tmp/agent-build-mnt
     sudo mount /tmp/agent-build.ext4 /tmp/agent-build-mnt || err "Failed to mount agent rootfs"
 
+    # Copy host DNS so chroot can resolve packages
+    sudo cp /etc/resolv.conf /tmp/agent-build-mnt/etc/resolv.conf
+
     log "Installing Alpine packages (openssh, python3, podman, curl, jq, bash)..."
     log "  This may take a minute..."
     sudo chroot /tmp/agent-build-mnt sh -c '
@@ -301,6 +304,8 @@ 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..."