Raise host frame payload limit so multi-client UART replies fit.

Use a uint16 LE length and 1024-byte max payload so CLIENT_INFO and BATTERY_STATUS no longer fail encoding past ~10 connected pods.

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

main/host_transport.h

@@ -19,7 +19,7 @@ void host_transport_set_cmd_queue(QueueHandle_t cmd_queue);
 QueueHandle_t host_transport_cmd_queue(void);
 
 /**
- * Build AA|len|payload|xor|CC and send via the registered TX backend.
+ * Build AA|len_lo|len_hi|payload|xor|CC and send via the registered TX backend.
  * Same semantics as uart_send_framed.
  */
 esp_err_t host_send_framed(const uint8_t *payload, size_t len);
@@ -31,6 +31,6 @@ esp_err_t host_send_framed(const uint8_t *payload, size_t len);
 void host_rx_bytes(const uint8_t *data, size_t len);
 
 /** Enqueue a completed uart_packet_t (payload[0]=msg type). */
-bool host_enqueue_packet(const uint8_t *payload, uint8_t len);
+bool host_enqueue_packet(const uint8_t *payload, size_t len);
 
 #endif