dangernoodle-io / TaipanMiner / 26702397875

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feat(adopt): breadboard v0.42.0 — die-temp (bb_system) + periodic timers (bb_timer) (#465)

- bump scripts/fetch_breadboard.py VERSION to v0.42.0 (adds bb_system_read_temp_celsius, bb_timer periodic API, bb_update_check outcome enum)

die-temp via bb_system wrapper:
- replace direct esp-idf temperature_sensor_* calls with bb_system_read_temp_celsius — removes the esp-idf leak in mining.c + asic_task.c and lights up die temp on the c3/s2 (was gated s3-only, reported 0)
- single read path: new mining_stats_sample_die_temp() helper does the read + mutex'd store, called from both the dongle loop and the asic task (was duplicated inline)
- classic esp32 (d0) has no modern sensor -> wrapper returns BB_ERR_UNSUPPORTED -> helper no-ops, temp_c stays 0 (honest; legacy sensor is uncalibrated)

periodic timers via bb_timer wrapper:
- replace direct esp_timer_create/esp_timer_start_periodic with bb_timer_periodic_create/_start at the two periodic sites: main.c stats-save (10min) + mining.c hw_avg rolling-hashrate (5s)
- s_stats_timer / s_hw_avg_timer are now bb_periodic_timer_t; add bb_timer to REQUIRES (mining + app component)
- esp_timer_get_time timestamps + ota_validator one-shot left unchanged (separate apis)

on-device validated (c3/s2/wroom32/bitaxe650): die temp c3 41C, s2 48.7C (both were 0), bitaxe650 49C, wroom32 0/clean-unsupported; hashrate_1m/10m/1h populate (5s bb_timer periodic fires); all software reset, 0 rejected

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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