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c37ce25fb7
Replaces the single load_bearing counter with three buckets measured
via a bounded (100µs) spin-poll of the task notification value after
the scan finds data:
race (<10µs) — notification arrived within ~10µs: callback-ordering
race between rcvevent write and xTaskNotifyGive a few
instructions later. Scan is noise.
micro (<100µs) — notification arrived within 100µs: still noise at
loop_interval scale.
stall (>=100µs) — notification did not arrive within the poll window.
Only this case could represent a real latency spike
that the scan is rescuing.
The 100µs spin cap is intentional: if we are wrong and this IS a real
stall, we only add 100µs to that one unlucky loop iteration.
The immediate ESP_LOGW on each hit now includes gap_us and the bucket
label so individual events can be investigated.
