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feat: bb_power_health vcore-collapse watchdog (pure detector/policy, host-tested) (#477)

- new component components/bb_power_health/ with bb_vcore_wd evaluator
- pure, no ESP-IDF/FreeRTOS deps; compiles on host and device
- api: bb_vcore_wd_eval(state, input) -> BB_VCORE_WD_{NONE,RECOVER,BACKOFF}
- warmup suppression (BB_VCORE_WD_WARMUP_MS, default 60 s)
- healthy accumulator resets burst counter after BB_VCORE_WD_HEALTHY_RESET_MS (5 min)
- collapse requires BB_VCORE_WD_COLLAPSE_POLLS (3) consecutive readings < 500 mV
- burst limiter: BB_VCORE_WD_BURST_MAX (3) recoveries per BB_VCORE_WD_WINDOW_MS (10 min)
- burst window expiry resets counter so recovery resumes after cooldown
- BACKOFF keeps evaluating; never permanently gives up
- all thresholds #ifndef-guarded and Kconfig-overridable
- 16 host tests, 100% branch coverage (22/22 branches)
- wire into native scaffold and platformio.ini

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

1700 of 1700 branches covered (100.0%)

Branch coverage included in aggregate %.

35 of 35 new or added lines in 1 file covered. (100.0%)

2822 of 2822 relevant lines covered (100.0%)

1227.84 hits per line