dangernoodle-io / breadboard / 27095727623

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feat(bb_power): VR monitor HAL + tps546 backend + /api/power route (#358)

- bb_power: portable handle/vtable HAL with poll/snapshot model (pthread_mutex), set_primary/primary, name; shared core compiled host+espidf
- bb_power_tps546: ESP-IDF backend — opens TPS546 on I2C bus, programs switch freq/OC limit/OC response, reads vout/iout/vin/temp via PMBus; tps546_decode.h ported from TaipanMiner (pure, no ESP-IDF)
- bb_power_routes: GET /api/power with route-extender support (route_id "power", order 1 after order-0 satellites); assembles schema + publishes into response descriptor; host twin with test hooks
- Tests: 51 new host tests (bb_power HAL, tps546_decode round-trips incl. neg-exp paths, /api/power route: present:true/false, error→null, extender fields, schema assembly); 1374 total, all pass
- Coverage: 100% lines + 100% branches on all new files
- Smoke: bb_power + bb_power_routes in all boards; bb_power_tps546 wired on esp32 + tdongle to prove espidf link — both SUCCESS

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

1512 of 1512 branches covered (100.0%)

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