dangernoodle-io / breadboard / 28887121898

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feat: add bb_core primitives — bb_clock_now_us, bb_once, bb_lock (#761)

- bb_clock_now_us: monotonic microsecond clock (esp_timer / clock_gettime)
- bb_once: priority-inversion-safe run-once (vTaskDelay wait on espidf, sched_yield on host)
- bb_lock: contention-instrumented mutex, two-level stats gate (compile CONFIG_BB_LOCK_STATS_ENABLE + runtime flag), best-effort destroy state-check, host pthread + espidf priority-inheritance backends

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

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