Make controller input best-effort and harden OTA rollback.

Accel/tap use fire-and-forget ESP-NOW with a 10 ms FreeRTOS-safe cadence, OTA recovers from seq gaps and auto-reboots after success, and bootloader app rollback confirms after a stable boot.

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

goTool/api_ble_measure.go

@@ -94,7 +94,7 @@ func serveBleStreamTest(w http.ResponseWriter, r *http.Request, link *managedHos
 		return
 	}
 	count := 50
-	periodMs := uint32(16)
+	periodMs := uint32(10)
 	tolMs := 2.0
 	timeoutS := 15.0
 	var clientID uint32