dangernoodle-io / breadboard / 27174308352

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feat(bb_ota_led): OTA-phase LED lifecycle with guaranteed terminal restore (#373)

Consumers wiring a bb_ota_progress_cb_t to drive an LED routinely forget to revert
on failure, so the LED latches (e.g. red) while the device keeps running (only
SUCCESS reboots) -- looking bricked. bb_ota_led owns the lifecycle: it routes phases
to consumer-supplied actions (updating/success/restore) and GUARANTEES `restore`
runs on every terminal-non-reboot outcome (FAIL/abort/unknown). LED rendering stays
consumer-side (board-specific bb_led semantics); this owns only the routing + revert
contract. Portable (bb_core only).

- ops {updating(ctx,pct), success(ctx), restore(ctx)} + bb_ota_led_init + bb_ota_led_progress
- 7 host tests incl the FAIL->restore contract, defensive default->restore, null-safety

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

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