dangernoodle-io / breadboard / 24914282480

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fix(ota_pull): configurable task core + PM lock (TA-226) (#82)

observed on tdongle-s3 v0.12.0: mid-OTA panic in the Core 1 idle task,
decoded stack: esp_cpu_unstall → get_rtc_dbias_by_efuse → prvIdleTask.
esp-idf's DVFS path races with esp_flash_* stall/unstall. PR #78 pinned
the OTA worker to Core 1, which exposed this race on boards where
Core 1 has a live idle task (no ASIC offload).

belt-and-suspenders:

- bb_ota_pull_set_task_core(int core) lets consumers override the
  hard-coded Core 1 affinity. bitaxe keeps Core 1 (frees Core 0 for
  httpd/stratum). tdongle-like boards should set 0 or tskNO_AFFINITY.
- acquire an ESP_PM_CPU_FREQ_MAX lock around the OTA flash operations
  (begin → finish) to prevent DVFS from re-evaluating cpu dbias while
  the other core is stalled for flash writes. gated by CONFIG_PM_ENABLE
  so builds without PM are unaffected.

applied to both ota_worker_task (/api/ota/update) and
ota_check_worker_task (/api/ota/check background worker).

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