flatbuffer base

flatbuffers/control/orphaned.fbs

@@ -0,0 +1,16 @@
+namespace hmmmm.ctrl.orphaned;
+
+// Client → Server: enumerate disconnected seats that still have buffered messages.
+// No body — request is the signal itself.
+table OrphanedRequest {}
+
+table OrphanedEntry {
+    seat_id:         uint64;
+    disconnect_tclk: uint64;   // virtual clock tick at time of disconnect
+    lost_count:      uint32;   // number of buffered messages waiting
+}
+
+// Server → Client: list of orphaned seats with pending buffers.
+table OrphanedResponse {
+    entries: [OrphanedEntry];
+}