libtmux:open-client

Open an SBCL/Linux subprocess client and check its tmux version. Checks the runtime profile and required OS facilities before resolving PROGRAM. An unsupported profile or facility signals UNSUPPORTED-PLATFORM; ERROR-FEATURE identifies the requirement. PROGRAM must resolve to a native x86_64 ELF tmux executable; pass the underlying binary when PATH selects a script or shim. SOCKET-NAME and SOCKET-PATH are mutually exclusive; omission selects tmux's default socket. No daemon is started. TIMEOUT is seconds; OUTPUT-LIMIT bounds combined stdout/stderr bytes per command. Signals an operational condition on version/launch failure. Returned configuration strings are owned by the client.