James L 8ee8e86563 Add WiFi disconnect watchdog + re-enable debug logging ...

- Remove -DNDEBUG to get LOG_TRACE output for WiFi disconnect investigation
- Add WiFi watchdog in main loop: detects WiFi loss, prints diagnostics
  (WiFi status, RSSI, heap, TCP state, bridge stats), then halts serial
  output after 5s grace period so operator can read the last log lines
- Device keeps running as LoRa repeater even when serial is frozen
- Reboot required to resume serial output

2026-02-25 10:23:36 -05:00

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