fix(calibration): close all four ADR-152 behavioral findings pre-hardware-session

The full-loop integration test surfaced three findings; fixing the third
exposed a fourth. All four are fixed and regression-guarded:

1. z-band squeeze (enrollment.rs) — anchor motion is now measured from
   frame-to-frame deltas of the deviation series (|Δz| > Z_DELTA_MOTION
   0.5 ∨ |Δφ| > π/6), not from the absolute motion_flagged, which fires
   at amplitude_z_median > 2.0 vs the EMPTY baseline and so conflated
   presence strength with motion. A strongly-reflecting still person
   (z = 3.0 — every frame flagged by the old heuristic) now enrolls.
   The old unit tests mocked (z=3.0, motion=false), a combination the
   real deviation() can never emit — which is exactly how the squeeze
   hid; tests now derive the flag from z the way the producer does.

2. variance-only presence (specialist.rs) — PresenceSpecialist gains a
   mean-shift channel: present when variance > threshold OR
   |mean − empty_mean| > mean_dist_threshold (trained at half the
   empty→occupied mean distance, None when the means don't separate).
   Detects the motionless person whose body raises the scalar mean but
   not its variance. Old persisted banks deserialize with the channel
   inert (serde default None) — variance-only behavior preserved,
   proven by a fixture test against pre-change JSON.

3. ungated hz embedding (extract.rs) — Features::embedding() zeroes
   breathing_hz/heart_hz below EMBED_MIN_SCORE (0.25), keeping the
   random in-band peaks of noise windows out of the posture/anomaly
   prototype space. Raw fields stay ungated (specialists have their
   own stricter gates).

4. heart-band lag-floor leakage (extract.rs, found while fixing 3) —
   a pure 0.30 Hz breathing signal scored 0.67 in the heart band at
   3.33 Hz: out-of-band rhythm leaks as a monotonic slope whose max
   sits at the band's lag floor, so score gating alone cannot stop it.
   autocorr_dominant now requires the winning lag to be an interior
   local maximum; band-edge "peaks" are rejected, true in-band peaks
   (interior by definition) are preserved.

full_loop.rs strengthened to drive the fixes end-to-end: the StandStill
anchor is now a z=3.0 strong reflector (unenrollable pre-fix), and a new
motionless-person runtime case proves mean-channel detection at empty-
level variance.

Validation: 41 calibration unit + 1 full-loop integration + 23 CLI tests
green; cargo test --workspace --no-default-features exit 0.

Co-Authored-By: RuFlo <ruv@ruv.net>

docs/adr/ADR-151-room-calibration-specialist-training.md

@@ -247,7 +247,7 @@ wifi-densepose room-status --room living-room
 | **P5** | heartbeat + restlessness + anomaly specialists; `runtime.rs` mixture + veto + confidence gating | End-to-end RoomState on hardware; anomaly veto verified | ✅ Done (`runtime.rs`, CLI `room-watch`; breathing read live on COM8 ESP32) |
 | **P6** | Baseline-drift `STALE` invalidation; SONA online adaptation; optional ADR-105 federation; HF teacher–student distillation | Drift marks bank STALE; AetherArena entry | ◐ Partial (STALE done; SONA/federation/HF-backbone = follow-ups) |
 
-**Current status (2026-06-10):** Stages 1–5 implemented with *statistical* specialists (threshold/prototype/autocorrelation). 55 tests (35 unit incl. multistatic + 1 full-loop integration + 19 CLI), all passing under qemu-aarch64. **Validation scope is precise:** baseline capture + HTTP API + auth are proven on real CSI (Pi-5 nexmon, 6,813 frames; and an ESP32-S3). The complete `baseline → enroll → train-room → infer` loop is now **proven in-process** on deterministic synthetic CSI (`tests/full_loop.rs`: clean baseline with zero motion flags, 8/8 anchors through the quality gate, 6 specialists trained, JSON bank round-trip, trained-bank inference 18±2 BPM positive / absent negative / foreign-baseline STALE; seed-robust). The one live runtime signal (breathing ~16–31 BPM via `room-watch`) used the *stateless* breathing head, **not** a trained bank; the clean empty-room loop has **not** yet run on-target — the remaining gap is strictly the hardware session (empty room + operator anchors). See the integration doc §7 for three behavioral findings from the full-loop test (z-band squeeze, variance-only presence, ungated hz embedding) worth fixing before that session. SOTA-intake decisions affecting this system (geometry conditioning, checkerboard alignment) are recorded in ADR-152. Open refinements: `--source-format adr018v6` (drive from the Pi's own nexmon), phase-based breathing carrier, RVF/HNSW storage, and the ADR-150 frozen HF backbone the specialists would distill from.
+**Current status (2026-06-10):** Stages 1–5 implemented with *statistical* specialists (threshold/prototype/autocorrelation). 55 tests (35 unit incl. multistatic + 1 full-loop integration + 19 CLI), all passing under qemu-aarch64. **Validation scope is precise:** baseline capture + HTTP API + auth are proven on real CSI (Pi-5 nexmon, 6,813 frames; and an ESP32-S3). The complete `baseline → enroll → train-room → infer` loop is now **proven in-process** on deterministic synthetic CSI (`tests/full_loop.rs`: clean baseline with zero motion flags, 8/8 anchors through the quality gate, 6 specialists trained, JSON bank round-trip, trained-bank inference 18±2 BPM positive / absent negative / foreign-baseline STALE; seed-robust). The one live runtime signal (breathing ~16–31 BPM via `room-watch`) used the *stateless* breathing head, **not** a trained bank; the clean empty-room loop has **not** yet run on-target — the remaining gap is strictly the hardware session (empty room + operator anchors). The four behavioral findings from the full-loop test (z-band squeeze, variance-only presence, ungated hz embedding, heart-band lag-floor leakage) are FIXED and regression-guarded — see the integration doc §7. SOTA-intake decisions affecting this system (geometry conditioning, checkerboard alignment) are recorded in ADR-152. Open refinements: `--source-format adr018v6` (drive from the Pi's own nexmon), phase-based breathing carrier, RVF/HNSW storage, and the ADR-150 frozen HF backbone the specialists would distill from.
 
 Validation per CLAUDE.md: `cargo test --workspace --no-default-features` green; hardware verification on the ESP32-S3 (currently COM8) before any release; witness bundle regenerated if the proof surface changes.