dangernoodle-io / TaipanMiner / 26863525047

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feat(esp32-s2): adopt bb_ota_boot OTA-only boot mode (#491)

the s2 (single-core, no-PSRAM) can't run in-place pull-OTA: TLS + OTA buffers
don't fit the fragmented runtime heap. adopt breadboard's bb_ota_boot — apply
arms an NVS flag + reboots, then the firmware pulls the new image at full
early-boot heap before any subsystem allocates, and reboots into it.

- esp32_s2_mini.h: BOARD_OTA_BOOT_MODE + PIN_STATUS_LED (GPIO 15)
- main.c: bb_ota_boot_run_if_pending() early in app_main (gated) + LED progress cb
- led.c: S2 single-GPIO status LED path (headless OTA feedback)
- sdkconfig/esp32-s2-mini: CONFIG_BB_LOG_UDP_SINK=y (headless observability)
- src/CMakeLists.txt: + bb_ota_boot

validated end-to-end on hardware: POST /api/update/boot -> reboot -> NTP sync ->
full-heap TLS pull of the 1MB image to ota_1 (100%, ~3%/s) -> reboot -> boots the
new image and mines ~244 kH/s with httpd serving. tdongle-s3 builds clean (gated
#ifdef no-ops on non-boot-mode boards).

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

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