R3A autonomous cold boot - 2026-10-02
Wiring: CH340 TX -> modem RX DISCONNECTED (user-checked); modem TX -> CH340 RX connected (passive log); GND connected.
Host prep (480s only): old logger PID 31009 (r2t4a) killed by PID; new uartlog PID 15262 -> logs/uart/r3a-20261002-115402.{log,raw};
  passive ping observer PID 15263 (host-ping-observer.sh, ping 172.16.42.1 ~3 s) -> r3a-host-ping.txt. NM aurora-ncm autoconnect=yes.
Power: user-reported off 11:54 (USB + battery), on 11:56 battery -> USB. Host confirms modem absent from lsusb at 11:54:21 and no host_if from 11:54:02.
UART: no board output before 11:56:14 (SBL1 Start) -> off-time >= ~132 s by host observer, ~2 min by user times (>= 90 s required).
No UART input, no fastboot, no host networking changes, no telnet until START OK (11:57:31.5). Telnet snapshot was read-only (r3a-snap.cmds).
