Alpine (musl libc) is incompatible with matrix-sdk-crypto-nodejs native binary
which requires glibc's ld-linux-x86-64.so.2. Switched all Node.js Dockerfiles
to node:24-slim (Debian/glibc). Also fixed docker-compose.matrix.yml network
naming from undefined mosaic-network to mosaic-internal.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>