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Two ESP32 edge-vitals logic bugs in edge_processing.c. Both are robustness/logic fixes — NOT validated-accuracy claims. True count/PCK vs labelled ground truth remains hardware/data-gated (COM9 ESP32-S3). #998 — n_persons over-counted (reported 4 for one person): update_multi_person_vitals() split top-K subcarriers into top_k_count/2 groups and marked EVERY group active, so one body's multipath always read the full EDGE_MAX_PERSONS. Added two pure, host-testable helpers: - count_distinct_persons(): per-group energy gate (EDGE_PERSON_MIN_ENERGY_RATIO) + spatial dedup (EDGE_PERSON_MIN_SC_SEP) so weak/adjacent multipath groups don't count as separate bodies. Strongest group always counts (>=1). - person_count_debounce(): a gated count must hold EDGE_PERSON_PERSIST_FRAMES consecutive frames before it's emitted, so a single noisy frame can't promote a phantom. The active flags now mark only the strongest stable_count groups. #996 — presence flag flickered at ~50cm despite high presence_score: the bare `score > threshold` compare chattered on a noisy score (field-observed 2.6-26.7 frame-to-frame). Replaced with a Schmitt trigger + clear-debounce (presence_flag_update): assert above threshold, hold in the dead band down to threshold * EDGE_PRESENCE_HYST_RATIO, clear only after EDGE_PRESENCE_CLEAR_FRAMES consecutive sub-low frames. presence_score itself is unchanged and still emitted for consumer-side thresholding. All thresholds are named, documented constants in edge_processing.h. Firmware builds clean for esp32s3 (idf.py build RC=0). Co-Authored-By: claude-flow <ruv@ruv.net>