`tracker_bridge::tracker_to_person_detections` documented itself as filtering
to `is_alive()` but never actually filtered — it forwarded every non-Terminated
track to the WebSocket stream. With 3 ESP32-S3 nodes × ~10 Hz CSI, transient
detections that fell outside the Mahalanobis gate created a steady stream of
new Tentative tracks that aged through Active and into Lost. Lost tracks are
kept in the tracker for `reid_window` (~3 s) so re-identification can match
them when a similar detection reappears, but they are NOT currently observed
and must not render as live skeletons. Up to ~90 ghost skeletons could
accumulate at any moment, hence the 22-24 phantoms users saw while
`estimated_persons` correctly reported 1.
Add `PoseTracker::confirmed_tracks()` that returns only `Tentative ∪ Active`
and rewire the bridge to use it. `Lost` tracks remain in the tracker for
re-ID; they just no longer ship to the UI. `active_tracks()` is left
unchanged for the AETHER re-ID consumers (ADR-024).
Regression test `test_lost_tracks_excluded_from_bridge_output` drives a
track to Active, lapses for `loss_misses + 1` ticks to push it to Lost,
and asserts `tracker_update` returns an empty Vec while the Lost track
is still present in `all_tracks()` (re-ID still works).
Validated:
- cargo test --workspace --no-default-features → 1,539 passed, 0 failed
- ESP32-S3 on COM7 still streaming live CSI (cb #32800)
