Wire mcltspice into the backend image: WineHQ 11.10 (matching the dev host),
i386 multiarch, Mesa software GL, a build-time Wine prefix seeded with the
LTspice.ini first-run config, and an entrypoint that starts Xvfb. The LTspice
install (exe/lib/examples) mounts from the host; the engine reads LTSPICE_DIR.
Gated for now: LTspice v26 stalls at graphics init under headless Wine in the
slim image (runs fine on a full desktop). The mount + LTSPICE_DIR are commented
in docker-compose.prod.yml so the engine fails fast as 'unavailable' rather than
hanging. ngspice is unaffected.
Ryan Malloy
1ec22c82dc