flatbuffer base

flatbuffers/control/setup_buf.fbs

@@ -0,0 +1,8 @@
+namespace hmmmm.ctrl.setup_buf;
+
+// Client → Server: configure the lost-message buffer for this seat.
+// Server → Client: echoes back the confirmed (possibly clamped) settings.
+table SetupBuf {
+    lost_buf_size:         uint32;   // max buffered messages per seat
+    client_lifetime_ticks: uint64;   // virtual ticks to keep buffer after disconnect
+}