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The display process now serves a Unix socket, /run/ledmatrix/control.sock, carrying versioned newline-delimited JSON commands that are acknowledged. Stage 1 moves on-demand start/stop (plus status, hello and ping) onto it; the cache-file mailbox stays as the fallback for one release. - src/ipc/contract.py: typed request/response envelopes, command args, error codes, NDJSON framing with a 64 KiB limit, socket path rules. - src/ipc/server.py: threaded server owned by the display. Handlers only queue onto a bounded queue and ack with the request id; the render thread drains it where it reads the mailbox. Bounded clients, timeouts, garbage/oversize/disconnect handling; 0660 socket in the cache dir's group plus SO_PEERCRED checks; skips cleanly on Windows or when off. - src/ipc/client.py: one short-timeout request; any failure raises ControlError(reason). - api_v3/display.py: on-demand start/stop try the socket, fall back to the mailbox exactly as before, and report transport/socket_error. - display_controller.py: start/close the server; the mailbox handler body is extracted into _handle_on_demand_request and shared by both paths. - docs/IPC_CONTROL_SOCKET.md: protocol, security model, stage plan. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>