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feat(bb_wifi): hostname from bb_nv + retry-forever-when-validated (#238)

bb_wifi_autoinit (EARLY-tier auto-register from Phase 2.8) now:

1. Reads hostname from bb_nv_config_hostname() before connecting, so
   DHCP and mDNS see the right name on first packet. PR-A added the
   hostname persistence; this is the consumer.

2. Retries the STA connect indefinitely (30s backoff) when the running
   firmware is validated via bb_ota_is_validated(). A network outage
   shouldn't wipe credentials on a known-good build. Gated by
   CONFIG_BB_WIFI_RETRY_FOREVER_WHEN_VALIDATED (default y).

3. Swallows connect errors and returns BB_OK so the EARLY-tier walker
   doesn't abort when wifi is unavailable. Provisioning-mode flows
   need the registry to keep running so HTTP can come up in AP mode.
   Consumers check bb_wifi_is_connected() to observe wifi state.

The autoinit retry loop (vTaskDelay + validated check) is ESP-IDF only
and cannot be exercised in host tests. On-device integration testing
covers this path via TaipanMiner bench (.78 tdongle).

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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