{
  "schema": "k230-uart-progress-breadcrumbs-two-sample-deltas-v1",
  "sample_numbers": [
    0,
    1
  ],
  "monotonic_time_ns": [
    8931042327,
    14048039806
  ],
  "monotonic_delta_ns": 5116997479,
  "jiffies_delta": 1280,
  "timer_irq_count_delta_modulo_u32": 252,
  "uart_irq_count_delta_modulo_u32": 0,
  "uart_rx_delta_modulo_u32": 0,
  "uart_tx_delta_modulo_u32": 0,
  "limits": "Host arrival order is not hardware RX timing. No pre-stimulus snapshot; no state after sample1. Printed SBI record does not prove its own ECALL returned."
}