dangernoodle-io / breadboard / 24906052028

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fix(ota_pull): abort on pause fail, wifi preflight, retry, pin to core 1 (B1-63) (#78)

pull ota was failing with ESP_ERR_HTTP_CONNECT on flaky networks or
when mining_pause couldn't take. five concrete fixes:

- check mining_pause() return value; abort cleanly with a clear error
  instead of proceeding with mining still running and tls contending
  for core 0 + sha256 hw
- pre-flight bb_wifi_has_ip() before esp_https_ota_begin — catches
  ota attempts fired during wifi reconnect (dns cache stale, no ip)
- retry esp_https_ota_begin up to 3x with 5/15/30s backoff.
  esp_err_http_connect covers dns, tcp syn, and tls handshake —
  routinely transient on home networks, especially post-reconnect
- pin ota worker + ota check worker to core 1 via
  xTaskCreatePinnedToCore. core 1 is genuinely idle during pause
  (chip quiesced on bitaxe per TA-216, sw mining paused on tdongle).
  frees core 0 of tls contention with httpd/mdns/log_stream/
  webui-polling. observed repro: bitaxe-403 task_wdt mid-ota
- one-line log at worker entry to confirm core affinity in field
  captures

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