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feat(bb_update_check): bb_update_check_set_task_core() to avoid IDLE0 starvation (B1-217) (#275)

The bb_update_check worker is created with xTaskCreate (no affinity) at
priority 1. On consumers where CPU 0 is already loaded (httpd + lwip +
wifi + stratum) and the worker happens to land on CPU 0, the mbedTLS
handshake + cert-bundle parse runs long enough without yielding to
starve IDLE0 past the task watchdog window — Task watchdog got
triggered. The following tasks/users did not reset the watchdog in
time: - IDLE0 (CPU 0). Reproduced on TaipanMiner tdongle-s3 with HW SHA
mining on core 1 + manual /api/ota/check.

Mirror the bb_ota_pull_set_task_core knob so consumers can pin the
worker to the core that has real headroom. Default stays tskNO_AFFINITY
so existing consumers see no behavior change. Setter must be called
before bb_update_check_register_init.

Host backend gets a no-op stub.

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

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