SOME PATIENTS
CAN'T PRESS THE
NURSE BUTTON.

# Stillness escalation — the module that exists to save lives.
# Every animal carries a live immobility clock; thresholds are
# configured per facility.

for track in confirmed_tracks:
    still_min = track.still_minutes(now)
    if still_min >= IMMOBILE_ALERT_MIN:
        log.add(f"CHECK RECOMMENDED: {track.label} {still_min:.0f}m",
                RED, cooldown=300)
        audio.raise_alarm()          # double-tone, hard to ignore
        hud.flash_perimeter(5.0)      # full-frame red strobe
    elif still_min >= IMMOBILE_WARN_MIN:
        log.add(f"STILLNESS WATCH: {track.label} {still_min:.0f}m")

# Cameras drift. Tracks must not.
# Scene shift is measured sub-pixel against a rolling reference
# frame, then applied to every track — identities and immobility
# timers survive full pans of the room.

(sdx, sdy), _ = cv2.phaseCorrelate(ref_frame, current_frame)
if hypot(sdx, sdy) > NOISE_FLOOR:
    delta = to_full_res(sdx - applied.x, sdy - applied.y)
    world.shift_all_tracks(delta)   # boxes, anchors, trails
    # [ redacted: reference cycling & residual transfer ]

# Sleeping dogs don't move — so intermittent detections are
# fused into one persistent identity instead of flickering boxes.

if track.is_stationary():
    ttl = LONG_HOLD          # patience for sleepers
    if track.content_changed(frame):   # texture verification
        track.strikes += 1   # 3 strikes → box is stale, drop it
else:
    ttl = SHORT_HOLD         # movers must keep confirming

# ACTIVITY PULSE — honesty rule, enforced in code:
# the vital sign is a metaphor rendered from MEASURED motion.
# The system never fabricates a data point. Ever.

act = max(tracked_speed_component, motion_field_component)
act_ema = act_ema * 0.94 + act * 0.06
bpm_target = REST_BPM + act_ema * DYNAMIC_RANGE
if act_ema > HIGH_ACTIVITY_FLOOR:      # sustained, not spikes
    alerts.high_activity(room)