Assign sequential pod IDs from the master with NVS-stable bindings.

Replaces MAC-byte self-IDs with master allocation (1–255), slave preferred-ID reconnect, debug reset via UART/UI, and rate-limited ASSIGN to avoid ESP-NOW NO_MEM storms.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/proto/uart_messages.proto

@@ -37,6 +37,11 @@ enum MessageType {
   TAP_CONFIG = 32;
   /** Master → host (BLE only): periodic pushed cache snapshot with ESP timestamp. */
   BLE_STREAM_TICK = 33;
+  /**
+   * Host → device: clear master client-id NVS map + live registry (and notify
+   * online slaves), or on a slave clear local master/id binding only.
+   */
+  CLIENT_ID_MAP_RESET = 34;
 }
 
 message UartMessage {
@@ -78,6 +83,8 @@ message UartMessage {
     TapConfigRequest tap_config_request = 39;
     TapConfigResponse tap_config_response = 40;
     BleStreamTick ble_stream_tick = 41;
+    ClientIdMapResetRequest client_id_map_reset_request = 42;
+    ClientIdMapResetResponse client_id_map_reset_response = 43;
   }
 }
 
@@ -349,6 +356,13 @@ message RestartResponse {
   uint32 client_id = 2;
 }
 
+/** Host → master or slave: clear persisted client-id assignment state. */
+message ClientIdMapResetRequest {}
+
+message ClientIdMapResetResponse {
+  bool success = 1;
+}
+
 /** Host → master: read/write global log level (esp_log_level_set("*", …)). */
 message SetLogLevelRequest {
   bool write = 1;