The VC-500W accepts one job at a time; anything sent while the tape is
moving comes back server-error-busy. Add IPPBusy, wait_until_idle and
print_job_paced so a batch goes through instead of failing from the
second label on.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Vunz4VLxAYDBnU5tLciLDC