Send large BLE host frames across multiple notifies.

Prefer ATT MTU 517 and chunk oversized responses so CLIENT_INFO/BATTERY work with many pods; reset the goTool parser after timeouts so partial frames do not poison the next exchange.

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

main/ble_host.h

@@ -16,7 +16,7 @@ bool ble_host_ready(void);
 /** Negotiated ATT MTU (default 23 until exchange). */
 uint16_t ble_host_att_mtu(void);
 
-/** Max notify/write payload bytes (ATT MTU - 3). */
+/** Max bytes per ATT notify/write (ATT MTU - 3). Frames may span multiple notifies. */
 uint16_t ble_host_max_payload(void);
 
 #endif