The desktop app joins wss:// sessions (rustls with webpki roots, certificates always checked, clear errors; FIGCRAFT_CA_FILE for private authorities), with one TLS session shared by the reader and writer threads. figcraft-server stops gracefully on SIGTERM/SIGINT/SIGHUP/Ctrl+C, ships in Linux x86_64/aarch64 release archives, and docs/server.md gains a Deploy on a Linux server guide with a hardened systemd unit, Caddyfile, nginx config and Dockerfile in packaging/server.
A file's library can be published to figcraft-server and enabled in other files by a share link (view access is enough); placing, styles, variables and library updates with overrides kept work as for local libraries, with a background check while the Assets panel is open. library.swap re-points instances, styles and variables to another library by name (one undo step, unmatched items listed). The server keeps per-file usage reports (library.usage).
figcraft-server hosts many files over the same hub the app uses for sessions, persists each as a checksummed snapshot plus an append-only log (synced before replies, compacted, damaged files skipped and reported) so restarts lose nothing confirmed, and gives per-file share links with edit or view access (hashed 128-bit tokens, revocable). The app can publish a file to a server and join server-hosted files; view-only tabs refuse edits. Protocol version 2.
BFlat